ptgdp: More error checking, remove erroneous continue

ptgdp

@@ -128,6 +128,7 @@ cachesong() {
 				extension="${extension##*/}"
 				extension="${extension##*.}"
 				filename="$filename.$extension"
+				[ -f "$_tmpfile"* ] || return 1
 				mv "$_tmpfile"* "$filename"
 				_return="$filename"
 				return 0
@@ -185,7 +186,6 @@ queuesong() {
 					"youtube-dl did not download a song for \"$1\"" \
 					normal dialog-error 3000
 				error "Could not download song \"$1\""
-				continue
 				;;
 		esac
 		_queue+=("$_return")