fix(virtual-device): Use empt string as default value for metadata field

Author: csuermann

package-lock.json

@@ -41,7 +41,7 @@
     "singleQuote": true
   },
   "dependencies": {
-    "axios": "^1.1.2",
+    "axios": "^1.6.5",
     "bottleneck": "^2.19.5",
     "color-convert": "^2.0.1",
     "dayjs": "^1.11.5",

package.json

@@ -38,7 +38,7 @@
       name: { value: '', required: true },
       //deviceId: { value: 'vshd-xxx', required: false },
       topic: { value: '', required: false },
-      metadata: { value: {}, required: false },
+      metadata: { value: '', required: false },
       connection: { type: 'vsh-connection', required: true },
       template: { value: 'SWITCH', required: true },
       retrievable: { value: false },