Description of problem:
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If we put some tag in `group by` option like `VM Department` or `Host department` and then drill graph for VM/Host getting unexpected error. 

Version-Release number of selected component (if applicable):
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Version 5.8.3.0.20171213193853_f1b4a89


How reproducible:
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Always

Steps to Reproduce:
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1. Navigate to cluster C&U graphs
2. select Group by option with suitable VM/Host tag
3. try to drill graph for VM/Host

Actual results:
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Unexpected error

FATAL -- : Error caught: [NameError] undefined local variable or method `typ' for #<EmsClusterController:0x00000018657530>

Expected results:
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It should show that VM / Host


Additional info:
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1. Video attaching for steps 
2. Production Log: http://pastebin.test.redhat.com/543536