remove boilerplate in UNO Exception constructor calls

Now that we have default values for Exception constructor params,
remove lots of boilerplate code.

Change-Id: I620bd641eecfed38e6123873b3b94aaf47922e74

sw/source/ui/vba/wordvbahelper.cxx

@@ -156,7 +156,7 @@ uno::Reference< text::XText > getCurrentXText( const uno::Reference< frame::XMod
     }
 
     if( !xText.is() )
-        throw  uno::RuntimeException("no text selection", uno::Reference< uno::XInterface >() );
+        throw  uno::RuntimeException("no text selection" );
 
     return xText;
 }