Add default locale for generated categories

The client expects at least a name to be set.

Regression of 2c566cf6.

fdroidserver/index.py

@@ -746,7 +746,7 @@ def make_v2(apps, packages, repodir, repodict, requestsdict, fdroid_signing_key_
     # include definitions for "auto-defined" categories, e.g. just used in app metadata
     for category in sorted(categories_used_by_apps):
         if category not in output['repo'][CATEGORIES_CONFIG_NAME]:
-            output['repo'][CATEGORIES_CONFIG_NAME][category] = dict()
+            output['repo'][CATEGORIES_CONFIG_NAME][category] = {"name": {DEFAULT_LOCALE: category}}
     # do not include defined categories if no apps use them
     for category in list(output['repo'].get(CATEGORIES_CONFIG_NAME, list())):
         if category not in categories_used_by_apps:

tests/repo/entry.json

@@ -3,7 +3,7 @@
   "version": 20002,
   "index": {
     "name": "/index-v2.json",
-    "sha256": "5e3c0eaafd99d3518da2bb2bc7565b2ebcb17775a2f4ccc33b7336901ec71a6f",
+    "sha256": "72146bc3bbbfd49c4e23435ca8ba13d58673a83fa4634f7ce2ea465616860293",
     "size": 53283,
     "numPackages": 10
   },

tests/repo/index-v2.json

@@ -534,9 +534,21 @@
           "en-US": "System"
         }
       },
-      "1": {},
-      "2.0": {},
-      "tests": {}
+      "1": {
+        "name": {
+          "en-US": "1"
+        }
+      },
+      "2.0": {
+        "name": {
+          "en-US": "2.0"
+        }
+      },
+      "tests": {
+        "name": {
+          "en-US": "tests"
+        }
+      }
     },
     "requests": {
       "install": [

tests/update.TestCase

@@ -1842,7 +1842,7 @@ class UpdateTest(unittest.TestCase):
         with open('repo/index-v2.json') as fp:
             index = json.load(fp)
         self.assertEqual(
-            {'Time': dict()},
+            {'Time': {'name': {'en-US': 'Time'}}},
             index['repo'][CATEGORIES_CONFIG_NAME],
         )
 
@@ -1867,7 +1867,7 @@ class UpdateTest(unittest.TestCase):
         with open('repo/index-v2.json') as fp:
             index = json.load(fp)
         self.assertEqual(
-            {'bar': dict(), 'foo': dict()},
+            {'bar': {'name': {'en-US': 'bar'}}, 'foo': {'name': {'en-US': 'foo'}}},
             index['repo'][CATEGORIES_CONFIG_NAME],
         )
 
@@ -1894,7 +1894,7 @@ class UpdateTest(unittest.TestCase):
         with open('repo/index-v2.json') as fp:
             index = json.load(fp)
         self.assertEqual(
-            {'System': {'name': {'en-US': 'System Apps'}}, 'Time': dict()},
+            {'System': {'name': {'en-US': 'System Apps'}}, 'Time': {'name': {'en-US': 'Time'}}},
             index['repo'][CATEGORIES_CONFIG_NAME],
         )