FINERACT-176: fixed missing throw exception in Teller module

- Fixed missing throw exception for validation errors in Teller Module
- added unit tests to confirm changes to TellerCommandFromApiJsonDeserializer

ReportedBy: subramanyasn

fineract-branch/src/main/java/org/apache/fineract/organisation/teller/serialization/TellerCommandFromApiJsonDeserializer.java

@@ -199,5 +199,7 @@ public final class TellerCommandFromApiJsonDeserializer {
 
         final String currencyCode = this.fromApiJsonHelper.extractStringNamed(CURRENCY_CODE, element);
         baseDataValidator.reset().parameter(CURRENCY_CODE).value(currencyCode).notExceedingLengthOf(3);
+
+        throwExceptionIfValidationWarningsExist(dataValidationErrors);
     }
 }