Kubernetes agent create node, when check deployment is alive if pod is not created will cause crash
<!--- Provide a general summary of the issue in the Title above -->

## Expected Behavior
<!--- Tell us what should happen -->
Can update node status after node is deployed.

## Current Behavior
<!--- Tell us what happens instead of the expected behavior -->
After node is deployed, cause crashed when check node status.

```bash
Traceback (most recent call last):
  File "main.py", line 9, in <module>
    create_node()
  File "/app/operations/create_node.py", line 162, in create_node
    _create_fabric_node()
  File "/app/operations/create_node.py", line 140, in _create_fabric_node
    print(pod, pod.status)
AttributeError: 'NoneType' object has no attribute 'status'
```

## Possible Solution
<!--- Not obligatory, but suggest a fix/reason for the bug, -->
Check if pod is not null object at first.

## Steps to Reproduce
<!--- Provide a link to a live example, or an unambiguous set of steps to -->
<!--- reproduce this bug. Include code to reproduce, if relevant -->
1. make start
2. MOCK=False PROXY=http://9.59.196.20:8085/engine make start-dashboard-dev `run at your computer`
3. create new agent
4. apply agent
5. create new node

## Context (Environment)
<!--- How has this issue affected you? What are you trying to accomplish? -->
<!--- Providing context helps us come up with a solution that is most useful in the real world -->

<!--- Provide a general summary of the issue in the Title above -->
OS: Ubuntu 18.04
Arch: x86_64
Kubernetes version: 1.13
Docker version: 19.03.3
Docker compose version: 1.24.1

## Detailed Description
<!--- Provide a detailed description of the change or addition you are proposing -->

## Possible Implementation
<!--- Not obligatory, but suggest an idea for implementing addition or change -->

diff --git a/src/agent/kubernetes-agent/src/operations/create_node.py b/src/agent/kubernetes-agent/src/operations/create_node.py
index e338524b..4cfd4192 100644
--- a/src/agent/kubernetes-agent/src/operations/create_node.py
+++ b/src/agent/kubernetes-agent/src/operations/create_node.py
@@ -137,7 +137,7 @@ def _create_fabric_node():
     node_status = NodeStatus.Error.value
     for i in range(1, MAX_QUERY_RETRY):
         pod = k8s_client.get_pod(AGENT_ID, deploy_name)
-        if pod.status.phase == "Running":
+        if pod and pod.status.phase == "Running":
             node_status = NodeStatus.Running.value
             break
         sleep(5)
['src/agent/kubernetes-agent/src/operations/create_node.py']