Improved 'move stock' form

- Better error checking on the form (provides form validation messages to user)

InvenTree/stock/forms.py

@@ -38,6 +38,8 @@ class CreateStockItemForm(HelperForm):
 
 class MoveStockItemForm(forms.ModelForm):
 
+    note = forms.CharField(label='Notes', required=True)
+
     class Meta:
         model = StockItem