Add check for empty selection

nop when empty

src/nnn.c

@@ -2084,6 +2084,11 @@ static bool cpmvrm_selection(enum action sel, char *path)
 {
 	int r;
 
+	if (!selbufpos) {
+		printmsg(messages[MSG_0_SELECTED]);
+		return FALSE;
+	}
+
 	if (!selsafe())
 		return FALSE;