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upas/Mail: check if plumb attrs are nil

--- a/sys/src/cmd/upas/Mail/mbox.c

+++ b/sys/src/cmd/upas/Mail/mbox.c

@@ -802,6 +802,8 @@

 	digest = plumblookup(pm->attr, "digest");

 	action = plumblookup(pm->attr, "mailtype");

+	if(digest == nil || action == nil)

+		return;

 	if(strcmp(action, "new") == 0){

 		if((m = load(pm->data, digest, 1)) == nil)

 			return;