different handling of MWE's head

libmwereader/mwe.cpp

@@ -70,7 +70,8 @@ bool LexicalUnit::IsHere(const Wccl::SentenceContext &sc,
 	if(!found_head){
 		std::string errmsg("MWE found, but no head for it.");
 		errmsg += " Offending unit: " + base_;
-		throw Wccl::WcclError(errmsg);
+		//throw Wccl::WcclError(errmsg);
+		return false;
 	}
 
 	return true;