TEIIDDES-1411: Using CASE statements within transformations cause an NPE

git-svn-id: http://anonsvn.jboss.org/repos/tdesigner/branches/7.4.x@2660 ceac5f5e-c25f-0410-8b95-ec8c2776e4a6

plugins/org.teiid.designer.udf/src/org/teiid/designer/udf/UdfManager.java

@@ -312,7 +312,7 @@ public FunctionLibrary getSystemFunctionLibrary() {
 
     public synchronized FunctionLibrary getFunctionLibrary() {
         //System.out.println("UdfManger.getFunctionLibrary()");
-        if( !changed ) {
+        if( !changed && this.cachedFunctionLibrary != null) {
             return this.cachedFunctionLibrary;
         }
         // Dynamically return a function library for each call rather than cache it here.