fix check when the second argument contains operator-characters

src/commands.hxx

@@ -232,7 +232,7 @@ class Command: public QObject {
         res += value.mid(start, m.capturedStart()-start);
         value.remove(0, m.capturedEnd());
         if (keepDelimiters && !m.captured(3).isEmpty()) res+=m.captured(3).trimmed();
-        if (++found==max) return res += value;
+        if (++found==max) return value.isEmpty() ? res : res += value;
       }
       return res;
     }
@@ -2622,6 +2622,7 @@ class Check: public Command {
         throw BadArgument(tag()+" has at most three arguments", allargs);
       cmd->_value1 = allargs[0];
       cmd->_cmp = allargs[1][0].toLatin1();
+      std::cout<<"ARGS: \""<<allargs.join("\", \"")<<"\"\n";
       if (allargs.size()==3) {
         cmd->_value2 = allargs[2];
       } else {