networkAllow not tested on failing @condSend() variable writes

[trethaller]

Currently clients are allowed to modify vars marked as condSend(false) without any error:

		if( t.condSend.expr.match(EConst(CIdent("false"))) )
			return macro {}; // no marking
		var condSend = loop(t.condSend);
		needRef = true;
		mark = macro if( $condSend ) { this.$rname = this.$fname; $mark; };

We discussed removing the "no marking" optimization and adding a checkWrite() call in the else case so all failing condSend() are properly tested on clients.