Only deconstruct with set fields

Author: Photonios

psqlextra/backend/hstore_required.py

@@ -85,8 +85,8 @@ def alter_field(self, model, old_field, new_field, strict=False):
         if not is_old_field_hstore and not is_new_field_hstore:
             return
 
-        old_required = getattr(old_field, 'required', [])
-        new_required = getattr(new_field, 'required', [])
+        old_required = getattr(old_field, 'required', []) or []
+        new_required = getattr(new_field, 'required', []) or []
 
         # handle field renames before moving on
         if str(old_field.column) != str(new_field.column):

psqlextra/backend/hstore_unique.py

@@ -82,8 +82,8 @@ def alter_field(self, model, old_field, new_field, strict=False):
         if not is_old_field_hstore and not is_new_field_hstore:
             return
 
-        old_uniqueness = getattr(old_field, 'uniqueness', [])
-        new_uniqueness = getattr(new_field, 'uniqueness', [])
+        old_uniqueness = getattr(old_field, 'uniqueness', []) or []
+        new_uniqueness = getattr(new_field, 'uniqueness', []) or []
 
         # handle field renames before moving on
         if str(old_field.column) != str(new_field.column):

psqlextra/fields/hstore_field.py

@@ -59,7 +59,10 @@ def deconstruct(self):
         name, path, args, kwargs = super(
             HStoreField, self).deconstruct()
 
-        kwargs['uniqueness'] = self.uniqueness or []
-        kwargs['required'] = self.required or []
+        if self.uniqueness:
+            kwargs['uniqueness'] = self.uniqueness
+
+        if self.required:
+            kwargs['required'] = self.required
 
         return name, path, args, kwargs