Bug 164247 [DataBinding] NPE from ObservableMapLabelProvider when value is null
When a null value is to be returned from getColumnText(...) a NPE is thrown. It's trying to do a toString() on the null value.
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/BindingTestSuite.java
addTestSuite(IDiffsTest.class);
        addTestSuite(ObservableTest.class);
        addTestSuite(RandomAccessListIteratorTest.class);
        addTestSuite(ThreadRealmTest.class);
        
        
        addTestSuite(EditMaskLexerAndTokenTest.class);
        addTestSuite(EditMaskParserTest.class);
        
        addTestSuite(WritableValueTest.class);
        
        addTest(BindingScenariosTestSuite.suite());
        
        
        
 
        addTestSuite(TextObservableValueTests.class);
        
        
        addTestSuite(ObservableSetContentProviderTest.class);
        
        
        addTestSuite(PersonTests.class);
        
        
        addTestSuite(ListBindingTest.class);
        addTestSuite(ValueBindingTest.class);
        
        
        addTestSuite(UnmodifiableObservableListTest.class);