fix: filter out languages without aliases

See glutanimate#35

Co-authored-by: jackliusr <jackliusr@gmail.com>

Author: Barabazs

src/syntax_highlighting/main.py

@@ -47,7 +47,9 @@
 #                        to show the user AND
 #  The "language aliases": short, cryptic names for internal
 #                          use by HtmlFormatter
-LANGUAGES_MAP = {lex[0]: lex[1][0] for lex in get_all_lexers()}
+# filter out langauges without aliases
+LEXERS = [item for item in get_all_lexers() if item[1]]
+LANGUAGES_MAP = {lex[0]: lex[1][0] for lex in LEXERS}
 
 
 ERR_LEXER = (