removes all lines consisting only of spaces

this really bothers me for some reason - nothing technical

InvenTree/build/models.py

@@ -118,7 +118,7 @@ class Build(MPTTModel):
 
     def get_absolute_url(self):
         return reverse('build-detail', kwargs={'pk': self.id})
-        
+
     reference = models.CharField(
         unique=True,
         max_length=64,
@@ -168,7 +168,7 @@ class Build(MPTTModel):
         null=True, blank=True,
         help_text=_('SalesOrder to which this build is allocated')
     )
-    
+
     take_from = models.ForeignKey(
         'stock.StockLocation',
         verbose_name=_('Source Location'),
@@ -177,7 +177,7 @@ class Build(MPTTModel):
         null=True, blank=True,
         help_text=_('Select location to take stock from for this build (leave blank to take from any stock location)')
     )
-    
+
     destination = models.ForeignKey(
         'stock.StockLocation',
         verbose_name=_('Destination Location'),
@@ -207,7 +207,7 @@ class Build(MPTTModel):
         validators=[MinValueValidator(0)],
         help_text=_('Build status code')
     )
-    
+
     batch = models.CharField(
         verbose_name=_('Batch Code'),
         max_length=100,
@@ -215,9 +215,9 @@ class Build(MPTTModel):
         null=True,
         help_text=_('Batch code for this build output')
     )
-    
+
     creation_date = models.DateField(auto_now_add=True, editable=False, verbose_name=_('Creation Date'))
-    
+
     target_date = models.DateField(
         null=True, blank=True,
         verbose_name=_('Target completion date'),
@@ -251,7 +251,7 @@ class Build(MPTTModel):
         help_text=_('User responsible for this build order'),
         related_name='builds_responsible',
     )
-    
+
     link = InvenTree.fields.InvenTreeURLField(
         verbose_name=_('External Link'),
         blank=True, help_text=_('Link to external URL')
@@ -272,7 +272,7 @@ class Build(MPTTModel):
         else:
             descendants = self.get_descendants(include_self=True)
             Build.objects.filter(parent__pk__in=[d.pk for d in descendants])
-    
+
     def sub_build_count(self, cascade=True):
         """
         Return the number of sub builds under this one.
@@ -295,7 +295,7 @@ class Build(MPTTModel):
         query = query.filter(Build.OVERDUE_FILTER)
 
         return query.exists()
-    
+
     @property
     def active(self):
         """
@@ -441,7 +441,7 @@ class Build(MPTTModel):
 
         # Extract the "most recent" build order reference
         builds = cls.objects.exclude(reference=None)
-        
+
         if not builds.exists():
             return None
 
@@ -543,7 +543,7 @@ class Build(MPTTModel):
         - The sub_item in the BOM line must *not* be trackable
         - There is only a single stock item available (which has not already been allocated to this build)
         - The stock item has an availability greater than zero
-        
+
         Returns:
             A list object containing the StockItem objects to be allocated (and the quantities).
             Each item in the list is a dict as follows:
@@ -648,7 +648,7 @@ class Build(MPTTModel):
         """
         Deletes all stock allocations for this build.
         """
-        
+
         allocations = BuildItem.objects.filter(build=self)
 
         allocations.delete()
@@ -1145,7 +1145,7 @@ class BuildItem(models.Model):
         """
 
         self.validate_unique()
-        
+
         super().clean()
 
         errors = {}
@@ -1159,7 +1159,7 @@ class BuildItem(models.Model):
             # Allocated part must be in the BOM for the master part
             if self.stock_item.part not in self.build.part.getRequiredParts(recursive=False):
                 errors['stock_item'] = [_("Selected stock item not found in BOM for part '{p}'").format(p=self.build.part.full_name)]
-            
+
             # Allocated quantity cannot exceed available stock quantity
             if self.quantity > self.stock_item.quantity:
                 errors['quantity'] = [_("Allocated quantity ({n}) must not exceed available quantity ({q})").format(