Created attachment 864207 [details]
cli script

Description of problem:
I accidentally passed empty plugin configuration when creating a datasource via CLI and useless/confusing error message was shown. 

Version-Release number of selected component (if applicable):
4.10.0-SNAPSHOT
Build Number :	
c526922

EAP6.2

How reproducible:
Always

Steps to Reproduce:
1. download CLI client and attached CLI script
2. edit CLI script and provide correct datasouces resource ID
2. ./rhq-cli.sh -s <RHQ IP> -p rhqadmin -u rhqadmin -f <path to test.js>
3. go to EAP->datasources->Inventory->Child history and check result of operation

Actual results:
Operation <Operation{operation='add', address=Address{path: subsystem=datasources,=testDatasource}, additionalProperties={jndi-name=java:jboss/datasources/testDatasource, driver-name=h2, connection-url=jdbc:h2:mem:testDatasource;DB_CLOSE_DELAY=-1}}> returned unparsable JSON, <"JBAS014701: Invalid resource address element '=testDatasource'. The key '' is not valid for an element in a resource address.">., rolled-back=false

Expected results:
Error should clearly show where is the problem. Nobody would guess that previous message is caused by empty plugin configuration.

Additional info:
Another issue is NPE which is thrown when null is passed instead of plugin configuration. Error saying something like 'plugin configuration required' should be thrown instead of just NPE.