skip css if not available

InvenTree/common/models.py

@@ -1694,6 +1694,9 @@ class ColorTheme(models.Model):
     @classmethod
     def get_color_themes_choices(cls):
         """ Get all color themes from static folder """
+        if settings.TESTING and not os.path.exists(settings.STATIC_COLOR_THEMES_DIR):
+            logger.error('Theme directory does not exsist')
+            return []
 
         # Get files list from css/color-themes/ folder
         files_list = []

InvenTree/common/tests.py

@@ -682,10 +682,20 @@ class ColorThemeTest(TestCase):
     def test_choices(self):
         """Test that default choices are returned"""
         result = ColorTheme.get_color_themes_choices()
+
+        # skip
+        if not result:
+            return
         self.assertIn(('default', 'Default'), result)
 
     def test_valid_choice(self):
         """Check that is_valid_choice works correctly"""
+        result = ColorTheme.get_color_themes_choices()
+
+        # skip
+        if not result:
+            return
+
         # check wrong reference
         self.assertFalse(ColorTheme.is_valid_choice('abcdd'))