Missing gomplate datasources breaks other apps too

[rustycl0ck]

Current Behavior: After adding a gomplate datasource, if the datasource file is missing, then the apps which even do not make use of that datasource, can not be installed or updated.

Expected Behavior: Even if the gomplate datasources are missing, mh apply my-gomplate-independent-app should still work.

This issue makes it impossible to use gomplate datasources with CI tools.