coverity#1158271 Uncaught exception

Change-Id: I1a39ed2fb8542cb1bc5a56ce8f78cafe4618aa79

writerperfect/source/impress/KeynoteImportFilter.cxx

@@ -234,11 +234,18 @@ throw( com::sun::star::uno::RuntimeException )
     if ( xContent.is() )
     {
         ucbhelper::Content aContent( xContent, Reference< ucb::XCommandEnvironment >(), comphelper::getProcessComponentContext() );
+        try
+        {
             if ( aContent.isFolder() )
             {
                 input.reset( new writerperfect::DirectoryStream( xContent ) );
                 bIsPackage = true;
             }
+        }
+        catch (...)
+        {
+            return OUString();
+        }
 
         libetonyek::KEYDocumentType type = libetonyek::KEY_DOCUMENT_TYPE_UNKNOWN;
         if ( !libetonyek::KEYDocument::isSupported( input.get(), &type ) )