python-tools.sh: Fix __all__ format violation

Make python-tools.sh generate empty __all__ as [] on one line instead of multi-line format, and remove trailing blank line.
Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/python-tools.sh

@@ -83,12 +83,15 @@ cmd_create_init()
 		done
 	fi
 
-	echo
+	if [ ${#seen[@]} -eq 0 ]; then
-	echo "__all__ = ["
+		echo "__all__ = []"
-	for dst_type in ${!seen[@]}; do
+	else
-		echo "    \"$dst_type\","
+		echo "__all__ = ["
-	done
+		for dst_type in ${!seen[@]}; do
-	echo "]"
+			echo "    \"$dst_type\","
+		done
+		echo "]"
+	fi
 
 	echo "# << $del <<"
 }