better error

src/ytdl_sub/script/parser.py

@@ -467,9 +467,7 @@ class _Parser:
                     self._pos += 1
 
                 if ch1 is None:
-                    raise StringFormattingException(
-                        "Open bracket at the end was not properly closed"
-                    )
+                    break  # will hit closing bracket error
 
                 if ch1 == "%":
                     self._pos += 1

tests/unit/script/test_parser.py

@@ -174,7 +174,7 @@ class TestParser:
 
 class TestParserBracketFailures:
     def test_bracket_open(self):
-        with pytest.raises(StringFormattingException):
+        with pytest.raises(InvalidSyntaxException, match=re.escape(str(BRACKET_NOT_CLOSED))):
             parse("{")
 
     def test_bracket_close(self):