LimitOffsetSqlLimiter applies 'LIMIT 0' if firstRow is set only.
When `Query::setFirstRow` is used, it's expected to produce the OFFSET only. However, it produces LIMIT clause also.

## Example:
```java
  someQuery.setFirstRow(5);
```

### Expected behavior
The generated query contains `OFFSET 5` and no `LIMIT` at all
### Actual behavior
The generated query contains `LIMIT 0 OFFSET 5`

I've created PR that fixes this issue: https://github.com/ebean-orm/ebean/pull/2904

diff --git a/ebean-api/src/main/java/io/ebean/config/dbplatform/LimitOffsetSqlLimiter.java b/ebean-api/src/main/java/io/ebean/config/dbplatform/LimitOffsetSqlLimiter.java
index 63534a27f..846ee8056 100644
--- a/ebean-api/src/main/java/io/ebean/config/dbplatform/LimitOffsetSqlLimiter.java
+++ b/ebean-api/src/main/java/io/ebean/config/dbplatform/LimitOffsetSqlLimiter.java
@@ -31,12 +31,12 @@ public class LimitOffsetSqlLimiter implements SqlLimiter {
     int firstRow = request.getFirstRow();
     int maxRows = request.getMaxRows();
 
-    if (maxRows > 0 || firstRow > 0) {
+    if (maxRows > 0) {
       sb.append(" ").append(LIMIT).append(" ").append(maxRows);
-      if (firstRow > 0) {
-        sb.append(" ").append(OFFSET).append(" ");
-        sb.append(firstRow);
-      }
+    }
+    if (firstRow > 0) {
+      sb.append(" ").append(OFFSET).append(" ");
+      sb.append(firstRow);
     }
 
     String sql = request.getDbPlatform().completeSql(sb.toString(), request.getOrmQuery());
diff --git a/ebean-test/src/test/java/org/tests/basic/TestLimitQuery.java b/ebean-test/src/test/java/org/tests/basic/TestLimitQuery.java
index 63183c7db..090efec8a 100644
--- a/ebean-test/src/test/java/org/tests/basic/TestLimitQuery.java
+++ b/ebean-test/src/test/java/org/tests/basic/TestLimitQuery.java
@@ -40,7 +40,7 @@ public class TestLimitQuery extends BaseTestCase {
     String sql = query.getGeneratedSql();
     if (isH2()) {
       assertThat(sql).contains("offset 3");
-      assertThat(sql).contains("limit 0");
+      assertThat(sql).doesNotContain("limit");
     }
   }
 
['ebean-api/src/main/java/io/ebean/config/dbplatform/LimitOffsetSqlLimiter.java', 'ebean-test/src/test/java/org/tests/basic/TestLimitQuery.java']