Issue With Meters REST API- DROP Type causing NPE,Wrong UNIT Type & Meter Type not throwing Exception on Response Body to prevent to create meter with Wrong Band Type Or Wrong Unit type

1. Create a meter by Using meters REST API - POST /meters/

{deviceId}

2. Create Meter Of Wrong Type or a BAND of wrong type leads to NPE

{ "code": 500, "message": "com.google.common.base.Preconditions.checkNotNull(Preconditions.java:212)" }

3. Create Meter Of Wrong UNIT Type leads to craeting meter of wrong Unit type.

Expected Result:

1. In case of Wrong Band Type, it should throw exception like "he requested type is not defined for meter".
2. In case of "DROP" Band Type, it should create a meter without precedence.
3. In case of Wrong Unit Type, It should throw exception like "he requested unit is not defined for meter"