Update file permissions and enhance error handling in API responses

api/api.php

@@ -220,10 +220,18 @@ class gbAPI {
             if (!is_file($db_path)) {
                 $api->answer(500, [
                     "error" => "database_not_found",
-                    "error_display" => "The Database was not found."
+                    "error_text" => "The Database was not found."
                 ], true);
             }
 
+            if (!is_writeable($db_path)) {
+                $this->answer(500, [
+                    "error" => "database_not_writeable",
+                    "error_text" => "The Database is not writeable."
+                ]);
+                return;
+            }
+
             $db = new PDO("sqlite:" . $db_path);
             $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
         }
@@ -243,6 +251,10 @@ class gbAPI {
 
         $value = $this->dbCommand($command, true, true, [":name" => $key]);
 
-        return $value[0]["value"];
+        if (isset($value[0]["value"])) {
+            return $value[0]["value"];
+        }else{
+            return;
+        }
     }
 }