xSheetDoc cannot be null here

...as the UNO_QUERY_THROW above would already have caused an exception

Change-Id: Ie0453b67716c64ddaddfa6becd498952a497be63
Reviewed-on: https://gerrit.libreoffice.org/48106Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sc/qa/extras/sctabviewobj.cxx

@@ -68,8 +68,6 @@ ScTabViewObj::ScTabViewObj()
 uno::Reference< uno::XInterface > ScTabViewObj::init()
 {
     uno::Reference< sheet::XSpreadsheetDocument > xSheetDoc(mxComponent, uno::UNO_QUERY_THROW);
-    CPPUNIT_ASSERT_MESSAGE("no calc document", xSheetDoc.is());
-
     uno::Reference< frame::XModel > xModel(xSheetDoc, uno::UNO_QUERY_THROW);
 
     return xModel->getCurrentController();