small bugfix (trimming filename)

libmwereader/mwereader.cpp

@@ -176,6 +176,7 @@ bool MWEReader::registered = TokenReader::register_path_reader<MWEReader>(
 		if(boost::algorithm::starts_with(option, "mwefile:")) {
 
 			std::string mwefile = option.substr(8);
+			boost::algorithm::trim(mwefile);
 			if(boost::filesystem::exists(mwefile))
 				load_mwes(mwefile);
 			else