Bug 1101803

Description of problem:
After importing a TMX file, click on the clear button will not have any effect.

Version-Release number of selected component (if applicable):
3.4

How reproducible:
Always

Steps to Reproduce:
1. Log in as admin and go to Translation Memory under administration
2. Create a new TM 
3. Import a tmx file (attached is a simple one) and verify the number of entries column changed from 0 to 1.
4. Click button clear on that row
5. Click Ok in the confirmation popup

Actual results:
Number of entries stays 1

Expected results:
Number of entries become 0 and delete button is enabled

Additional info:
Server log:
0:22:38,606 ERROR [org.zanata.async.AsynchronousTaskExecutor] (DefaultQuartzScheduler_Worker-8) Exception when executing an asynchronous task.: java.lang.NullPointerException
	at org.zanata.action.TranslationMemoryAction$1.call(TranslationMemoryAction.java:119) [classes:]
	at org.zanata.action.TranslationMemoryAction$1.call(TranslationMemoryAction.java:112) [classes:]
	at org.zanata.async.AsynchronousTaskExecutor$1.execute(AsynchronousTaskExecutor.java:76) [classes:]
	at org.jboss.seam.security.Identity.runAs(Identity.java:743) [jboss-seam-2.3.1.Final.jar:2.3.1.Final]
	at org.jboss.seam.security.RunAsOperation.run(RunAsOperation.java:75) [jboss-seam-2.3.1.Final.jar:2.3.1.Final]
	at org.zanata.async.AsynchronousTaskExecutor.runAsynchronously(AsynchronousTaskExecutor.java:96) [classes:]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_30]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.6.0_30]