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Description of problem:

Applying errata via Host Collection fails with error (NoMethodError): undefined method `join' for #<String:0x00007f5b91925380>


Version-Release number of selected component (if applicable):

7.0


How reproducible:

100%


Steps to Reproduce:
1. Create a Host Collection and add a few hosts (I have added two hosts, both are provisioned from the satellite server)
2. Next click Errata Installation under Actions, select all (Erratas) > from install selected dropdown choose remote execution  

Actual results:

Fails with the below error

Oops, we're sorry but something went wrong undefined method `join' for #<String:0x00007f5baa3c1100>

Expected results:

Should apply the errata on the content hosts

Additional info: