Fix UpdateNode test failure
**Summary of the defect**
The Update Node test that has passed in the branch previously failed with this error on master.

```
Node 0 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:40:50.999999425Z! (java.lang.NullPointerException)
Node 0 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:47:25.999999193Z! (java.lang.NullPointerException)
Node 1 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:40:50.999999425Z! (java.lang.NullPointerException)
Node 1 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:47:25.999999193Z! (java.lang.NullPointerException)
Node 2 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:40:50.999999425Z! (java.lang.NullPointerException)
Node 2 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:47:25.999999193Z! (java.lang.NullPointerException)
Node 3 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:40:50.999999425Z! (java.lang.NullPointerException)
Node 3 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:47:25.999999193Z! (java.lang.NullPointerException)
Node 4 has exception:- Only default usage prices available for function Freeze @ 2020-11-20T04:47:25.999999193Z! (java.lang.NullPointerException)
```
**How to reproduce (if possible)**


**Service logs (if applicable)**

https://hedera-hashgraph.slack.com/archives/CKWHL8R9A/p1605848071329100

**Additional Context**
Add any other context about the problem here. Attach any logs here, if applicable.

diff --git a/hedera-node/src/main/java/com/hedera/services/fees/calculation/AwareFcfsUsagePrices.java b/hedera-node/src/main/java/com/hedera/services/fees/calculation/AwareFcfsUsagePrices.java
index 315c15bd5c..a70b378c4a 100644
--- a/hedera-node/src/main/java/com/hedera/services/fees/calculation/AwareFcfsUsagePrices.java
+++ b/hedera-node/src/main/java/com/hedera/services/fees/calculation/AwareFcfsUsagePrices.java
@@ -9,9 +9,9 @@ package com.hedera.services.fees.calculation;
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -118,10 +118,10 @@ public class AwareFcfsUsagePrices implements UsagePricesProvider {
 			return usagePrices;
 		} catch (Exception e) {
 			log.warn(
-					"Only default usage prices available for function {} @ {}! ({})",
+					"Default usage price will be used, no specific usage prices available for function {} @ {}!",
 					function,
-					Instant.ofEpochSecond(at.getSeconds(), at.getNanos()),
-					e);
+					Instant.ofEpochSecond(at.getSeconds(), at.getNanos())
+					);
 		}
 		return DEFAULT_USAGE_PRICES;
 	}
diff --git a/hedera-node/src/test/java/com/hedera/services/fees/calculation/AwareFcfsUsagePricesTest.java b/hedera-node/src/test/java/com/hedera/services/fees/calculation/AwareFcfsUsagePricesTest.java
index 7f3054d461..e3b06f824a 100644
--- a/hedera-node/src/test/java/com/hedera/services/fees/calculation/AwareFcfsUsagePricesTest.java
+++ b/hedera-node/src/test/java/com/hedera/services/fees/calculation/AwareFcfsUsagePricesTest.java
@@ -9,9 +9,9 @@ package com.hedera.services.fees.calculation;
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -206,7 +206,7 @@ class AwareFcfsUsagePricesTest {
 		// then:
 		assertEquals(DEFAULT_USAGE_PRICES, actual);
 		assertEquals(1, mockAppender.size());
-		assertEquals("WARN - Only default usage prices available for function UNRECOGNIZED @ 1970-01-15T06:56:06Z! (java.lang.NullPointerException)",
+		assertEquals("WARN - Default usage price will be used, no specific usage prices available for function UNRECOGNIZED @ 1970-01-15T06:56:06Z!",
 				mockAppender.get(0));
 
 		// tearDown:
['hedera-node/src/main/java/com/hedera/services/fees/calculation/AwareFcfsUsagePrices.java', 'hedera-node/src/test/java/com/hedera/services/fees/calculation/AwareFcfsUsagePricesTest.java']