fixed import failure with leading commas in input strings

cookbook/helper/ingredient_parser.py

@@ -232,6 +232,9 @@ class IngredientParser:
             match = re.search('\((.[^\(])+\)', ingredient)
             ingredient = ingredient[:match.start()] + ingredient[match.end():] + ' ' + ingredient[match.start():match.end()]
 
+        # leading spaces before commas result in extra tokens, clean them out
+        ingredient = ingredient.replace(' ,', ',')
+
         tokens = ingredient.split()  # split at each space into tokens
         if len(tokens) == 1:
             # there only is one argument, that must be the food
@@ -303,4 +306,7 @@ class IngredientParser:
                 note = food + ' ' + note
                 food = food[:Food._meta.get_field('name').max_length]
 
+        if len(food.strip()) == 0:
+            raise ValueError(f'Error parsing string {ingredient}, food cannot be empty')
+
         return amount, unit, food, note[:Ingredient._meta.get_field('note').max_length].strip()

cookbook/tests/other/test_ingredient_parser.py

@@ -60,6 +60,7 @@ def test_ingredient_parser():
         "2-3 c Water": (2, "c", "Water", "2-3"),
         "Pane (raffermo o secco) 80 g": (80, "g", "Pane", "raffermo o secco"),
         "1 Knoblauchzehe(n), gehackt oder gepresst": (1.0, None, 'Knoblauchzehe(n)', 'gehackt oder gepresst'),
+        "1 Porreestange(n) , ca. 200 g": (1.0, None, 'Porreestange(n)', 'ca. 200 g'),  # leading space before comma
         # test for over long food entries to get properly split into the note field
         "1 Lorem ipsum dolor sit amet consetetur sadipscing elitr sed diam nonumy eirmod tempor invidunt ut l Lorem ipsum dolor sit amet consetetur sadipscing elitr sed diam nonumy eirmod tempor invidunt ut l": (
             1.0, 'Lorem', 'ipsum', 'dolor sit amet consetetur sadipscing elitr sed diam nonumy eirmod tempor invidunt ut l Lorem ipsum dolor sit amet consetetur sadipscing elitr sed diam nonumy eirmod tempor invidunt ut l'),

cookbook/views/views.py

@@ -637,7 +637,7 @@ def test(request):
     parser = IngredientParser(request, False)
 
     data = {
-        'original': '1 LoremipsumdolorsitametconsetetursadipscingelitrseddiamnonumyeirmodtemporinviduntutlLoremipsumdolorsitametconsetetursadipscingelitrseddiamnonumyeirmodtemporinviduntutl'
+        'original': '1 Porreestange(n) , ca. 200 g'
     }
     data['parsed'] = parser.parse(data['original'])