Fix pylint C1801 errors

Signed-off-by: Pierros Papadeas <pierros@papadeas.gr>

.pylintrc

@@ -10,7 +10,6 @@ disable=
     C0411,
     C0412,
     C0325,
-    C1801,
     E1101,
     E0213,
     R0101,

db/base/utils.py

@@ -47,9 +47,9 @@ def calculate_statistics():
         mode_data.append(tr)
 
     # needed to pass testing in a fresh environment with no modes in db
-    if len(mode_label) == 0:
+    if not mode_label:
         mode_label = ['FM']
-    if len(mode_data) == 0:
+    if not mode_data:
         mode_data = ['FM']
 
     band_label = []

db/base/views.py

@@ -128,7 +128,7 @@ def transmitter_suggestion(request):
         transmitter.reviewed = False
         transmitter.approved = False
         uuid = transmitter_form.cleaned_data['uuid']
-        if uuid is not None and len(uuid) > 0:
+        if uuid:
             transmitter.uuid = uuid
         transmitter.save()