Fix flake8 errors

osmtm/models.py

@@ -104,6 +104,7 @@ class ST_SetSRID(GenericFunction):
     name = 'ST_SetSRID'
     type = Geometry
 
+
 DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
 Base = declarative_base()
 make_translatable()
@@ -156,6 +157,7 @@ def as_dict(self):
             "is_project_manager": self.is_project_manager
         }
 
+
 # task states
 READY = 0
 INVALIDATED = 1
@@ -433,6 +435,7 @@ def area_after_insert(mapper, connection, target):
         values(centroid=ST_Centroid(target.geometry))
     )
 
+
 project_allowed_users = Table(
     'project_allowed_users',
     Base.metadata,
@@ -449,6 +452,7 @@ class PriorityArea(Base):
     def __init__(self, geometry):
         self.geometry = geometry
 
+
 project_priority_areas = Table(
     'project_priority_areas',
     Base.metadata,
@@ -714,4 +718,5 @@ def default(self, obj):  # pragma: no cover
 
         return JSONEncoder.default(self, obj)
 
+
 dumps = functools.partial(_dumps, cls=ExtendedJSONEncoder)

osmtm/tests/__init__.py

@@ -80,6 +80,7 @@ def populate_db():
     transaction.commit()
     DBSession.remove()
 
+
 populate_db()