Resolve "(TID) Fix add device tab via WebUI"

Closes #88 (closed)

src/webui/service/device/routes.py

@@ -65,6 +65,7 @@ def add():
             (DeviceOperationalStatusEnum.Value(key), key.replace('DEVICEOPERATIONALSTATUS_', '')))
 
     # items for Device Type field
+    form.device_type.choices = []
     for device_type in DeviceTypeEnum:
         form.device_type.choices.append((device_type.value,device_type.value))