Fix sonar findings

app/classes/shared/main_controller.py

@@ -85,7 +85,7 @@ class Controller:
                 encoding="utf-8",
             ) as f:
                 self.auth_tracker = json.load(f)
-        except:
+        except (FileNotFoundError, json.JSONDecodeError):
             self.auth_tracker = {}
 
     def log_attempt(self, remote_ip, username):

app/frontend/templates/panel/loading.html

@@ -10,7 +10,7 @@
     <div class="card-header justify-content-between align-items-center" style="border: none;">
         <div id="image-div" style="width: 100%;">
             <img class="img-center" id="logo-animate" src="../static/assets/images/crafty-logo-square-1024.png"
-                width="20%" style="clear: both;">
+                alt="Crafty Logo, Crafty is loading" width="20%" style="clear: both;">
         </div>
         <br>
         </br>
@@ -70,4 +70,4 @@
     });
 
 </script>
-{% end %}
+{% end %}