CommandAdd: if nothingprocessor is used, empty pageData is not an error

cli/commandadd.cpp

@@ -56,7 +56,8 @@ AddFileResult CommandAdd::addFile(QString path)
 		pageData = processor->process(Utils::readFile(absPath));
 	}
 
-	if(pageData.isEmpty())
+	// Could happen if a file corrupted for example
+	if(pageData.isEmpty() && processor != nothingProcessor)
 	{
 		Utils::error() << "Could not get any content for " << absPath << endl;
 	}