Werk #7052: fileinfo.groups: fix display bug in service discovery

Component	Checks & agents
Title	fileinfo.groups: fix display bug in service discovery
Date	Jan 14, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The service discovery for fileinfo.groups showed an error starting with "Invalid check parameter: Undefined key 'group_patterns'". This commit resolves this issue.

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