Created attachment 645376 [details]
Error log

Description of problem:
If try to add phpmyadmin/rockmongo without mysql/mongodb added, following error is shown:
:exception=>#<OpenShift::NodeException: Node execution failure (invalid exit code from node). 
If the problem persists please contact Red Hat support.>}],
:exception=>#<OpenShift::NodeException: Node execution failure (invalid exit code from node). 
If the problem persists please contact Red Hat support.>}


Version-Release number of selected component (if applicable):
int.openshift.redhat.com
rhc-1.1.7.gem

How reproducible:
always

Steps to Reproduce:
1.Create an app
#rhc app create ews1 jbossews-1.0 -l jinzhang+1 -p redhat
2.Add cartridges like phpmyadmin, rockmongo which need dependencies
#rhc cartridge add rockmongo-1.1 -a ews1 -p redhat
  
Actual results:
Node execution failure. Please refer to the attached log.

Expected results:
Mearningful message is shown to ask user to add db first.

Additional info:
1. This issue is also reproduced when adding 10gen-mms-agent-0.1 witout  valid mms credentials.