[518979] Remove context entries with an empty cache in EMFModelProvider 

Remove entries with empty/expired caches from map to avoid keeping
entries for all contexts ever used.

Bug: 518979
Change-Id: I00225df2ce3a7e916a4bcf57757b18b14e5fc139
Signed-off-by: Martin Fleck <mfleck@eclipsesource.com>
1 file changed