Move user location code outside of GET handler for /<fingerprint>

Technically, all of the operations available via /<fingerprint> will access the user object in some fashion, so loading of the user object can be done outside of the GET if-block.

server.py

@@ -72,9 +72,9 @@ def register():
 
 @app.route("/<fingerprint>", methods=["GET", "UPDATE", "DELETE"])
 def render_data(fingerprint):
-    if request.method == "GET":
     user = User.query.filter_by(fingerprint=fingerprint).first()
     if not user: return abort(404)
+    if request.method == "GET":
         resp = make_response(user.data or b"", 200)
         resp.headers["Content-Type"] = user.mime_type
         return resp