Error to add a new ingredient wieght

[hhugoac]

Steps to Reproduce

1. Go to the Nutritional plans and select one, then add a meal
2. Click on the pencil to add an ingredient
3. Search an ingredient and type the name
4. In the weight field add a number less than 1.0 and the app sends an exception

Expected results:
An error message or hint into the textfield to send an explaining the error

Actual results:
The result is that the page pop and didn't save the ingredient

Logs

#1 NutritionPlansProvider.addMealItem (package:wger/providers/nutrition.dart:260:18) nutrition.dart:260 2 [log] Saved ingredient 'Meal One' to db cache [ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: [Ensure this value is greater than or equal to 1.] #0 WgerBaseProvider.post (package:wger/providers/base_provider.dart:106:7) base_provider.dart:106 #1 NutritionPlansProvider.addMealItem (package:wger/providers/nutrition.dart:260:18) nutrition.dart:260