[2.0][DDC-402] Fixed issue with MemcacheCache througing E_WARNINGs if no cache entry is found.
[2.0][DDC-402] Fixed issue with MemcacheCache througing E_WARNINGs if no cache entry is found.

git-svn-id: c8c49e1140e1cd2a8fb163f3c2b0f6eec231a71d@7329 625475ce-881a-0410-a577-b389adb331d8

j13k/doctrine1,j13k/doctrine1