Fix issue with bad color names (#3816)

* fix issue with bad color names and define element colors at one place and reuse
* fix bad tartan color
* verify color in gradient block
* add thread color tests
* use default color behavior for elements linked to non-existing definitions (gradients)
* Added mypy change for tests (authored by: CapellanCitizen)

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/extensions/params.py b/lib/extensions/params.py
index cb38585e..0bba13fe 100755
--- a/lib/extensions/params.py
+++ b/lib/extensions/params.py
@@ -721,9 +721,9 @@ class Params(InkstitchExtension):
             elif node.tag in EMBROIDERABLE_TAGS and not node.get_path():
                 pass
             else:
-                if element.get_style("fill", 'black') and not element.get_style("fill-opacity", 1) == "0":
+                if element.fill_color is not None and not element.get_style("fill-opacity", 1) == "0":
                     classes.append(FillStitch)
-                if element.get_style("stroke") is not None:
+                if element.stroke_color is not None:
                     classes.append(Stroke)
                     if len(element.path) > 1:
                         classes.append(SatinColumn)