master.py: split generation of trophies and generation of icons

May be used in development environment when database is populated and 
deleting/recreating trophies throws an error because it will broke 
non-null relationships.

master.py

@@ -186,8 +186,15 @@ def create_trophies():
     db.session.commit()
 
     print(f"Created {len(tr)} trophies.")
+    # Create their icons
+    create_trophies_icons()
+
+
+def create_trophies_icons():
+    tr = []
+    with open(os.path.join(app.root_path, "data", "trophies.yaml")) as fp:
+        tr = yaml.safe_load(fp.read())
 
-    # Create their icons in /app/static/images/trophies
     names = [slugify.slugify(t["name"]) for t in tr]
     src = os.path.join(app.root_path, "data", "trophies.png")
     dst = os.path.join(app.root_path, "static", "images", "trophies")
@@ -210,6 +217,7 @@ def create_trophies():
     for (name, icon) in zip(names, trophy_iterator(img)):
         icon.save(os.path.join(dst, f"{name}.png"))
 
+
 def create_forums():
     # Clean up forums
     forums("clear")
@@ -285,6 +293,7 @@ commands = {
     "forums":                   forums,
     "create-groups-and-privs":  create_groups_and_privs,
     "create-trophies":          create_trophies,
+    "create-trophies-icons":    create_trophies_icons,
     "create-forums":            create_forums,
     "add-group":                add_group,
     "enable-user":              enable_user,