lettering: ignore invalid glyph layers (#1892)

lib/elements/fill_stitch.py

@@ -216,7 +216,8 @@ class FillStitch(EmbroideryElement):
     @property
     @param('staggers',
            _('Stagger rows this many times before repeating'),
-           tooltip=_('Length of the cycle by which successive stitch rows are staggered. Fractional values are allowed and can have less visible diagonals than integer values.'),
+           tooltip=_('Length of the cycle by which successive stitch rows are staggered.'
+                     'Fractional values are allowed and can have less visible diagonals than integer values.'),
            type='int',
            sort_index=6,
            select_items=[('fill_method', 0), ('fill_method', 2), ('fill_method', 3)],

lib/lettering/font_variant.py

@@ -69,7 +69,10 @@ class FontVariant(object):
             self._clean_group(layer)
             layer.attrib[INKSCAPE_LABEL] = layer.attrib[INKSCAPE_LABEL].replace("GlyphLayer-", "", 1)
             glyph_name = layer.attrib[INKSCAPE_LABEL]
-            self.glyphs[glyph_name] = Glyph(layer)
+            try:
+                self.glyphs[glyph_name] = Glyph(layer)
+            except AttributeError:
+                pass
 
     def _clean_group(self, group):
         # We'll repurpose the layer as a container group labelled with the

lib/stitches/fill.py

@@ -38,7 +38,7 @@ def row_num(point, angle, row_spacing):
 
 def adjust_stagger(stitch, angle, row_spacing, max_stitch_length, staggers):
     if staggers == 0:
-        staggers = 1 # sanity check to avoid division by zero.
+        staggers = 1  # sanity check to avoid division by zero.
     this_row_num = row_num(stitch, angle, row_spacing)
     stagger_phase = (this_row_num / staggers) % 1
     stagger_offset = stagger_phase * max_stitch_length

lib/stitches/guided_fill.py

@@ -149,7 +149,7 @@ def take_only_line_strings(thing):
 
 def apply_stitches(line, max_stitch_length, num_staggers, row_spacing, row_num):
     if num_staggers == 0:
-        num_staggers = 1 # sanity check to avoid division by zero.
+        num_staggers = 1  # sanity check to avoid division by zero.
     start = ((row_num / num_staggers) % 1) * max_stitch_length
     projections = np.arange(start, line.length, max_stitch_length)
     points = np.array([line.interpolate(projection).coords[0] for projection in projections])