Emma is broken (see Jenkins)

http://jenkins.tribler.org/job/Build_Test-TSAP_Android_pull-requests/112/console
```
...
     [exec] org.tribler.tsap.channels.tests.ChannelListFragmentTest:.
     [exec] org.tribler.tsap.channels.tests.ChannelTest:...
     [exec] org.tribler.tsap.channels.tests.MainActivityTest:..INSTRUMENTATION_RESULT: shortMsg=java.lang.NullPointerException
     [exec] INSTRUMENTATION_RESULT: longMsg=java.lang.NullPointerException
     [exec] INSTRUMENTATION_CODE: 0
     [echo] Setting permission to download the coverage file...
     [echo] Downloading coverage file into project directory...
     [exec] 21 KB/s (1711 bytes in 0.078s)
     [echo] Extracting coverage report...
   [report] com.vladium.emma.EMMARuntimeException: [CLASS_STAMP_MISMATCH] runtime version of class [org.tribler.tsap.thumbgrid.ThumbItem] in the coverage data is not consistent with the version of this class in the metadata, possibly because stale metadata is being used for report generation.
   [report] 	at com.vladium.emma.report.ReportDataModel.getView(ReportDataModel.java:95)
...
Emma: looking for coverage reports in the provided path: **/bin/coverage*.xml
Emma: no coverage files found in workspace. Was any report generated?
Build step 'Record Emma coverage report' changed build result to FAILURE
...
```