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mothra: fix nil crash on missing name/src attributes for source/video/audio/embed/frame/iframe

--- a/sys/src/cmd/mothra/rdhtml.c

+++ b/sys/src/cmd/mothra/rdhtml.c

@@ -884,8 +884,10 @@

 			if(str && *str){

 				free(g.state->name);

 				g.state->name = strdup(str);

-			} else

+			} else if(g.state->link)

 				str = g.state->link;

+			else

+				str = "";

 			pl_htmloutput(&g, 0, str, 0);

 			free(g.state->link);

 			g.state->link=0;