added tests for all formatters; stylecheck workflow now also checks in tests now

html_to_django/formatters/style_raw_formatter.py

@@ -4,7 +4,10 @@ from .style_formatter import parse_style, style_to_string
 
 def format(soup: BeautifulSoup) -> None:
     for element in soup.find_all(attrs={"dj-style-raw": True}):
-        style = parse_style(element["style"])
+        if element.has_attr("style"):
+            style = parse_style(element["style"])
+        else:
+            style = {}
         dj_style = element.get("dj-style-raw")
         for name, value in [declaration.split(";") for declaration in dj_style.split("~") if declaration]:
             style[name] = value