Fix default values in device model

Signed-off-by: Piet Gömpel <pietgoempel@gmail.com>

Author: Pietfried

config/v2/component_config/custom/Connector_1_1.json

@@ -20,7 +20,7 @@
       ],
       "description": "This variable reports current availability state for the Connector. Optional, because already reported in StatusNotification.",
       "type": "string",
-      "default": ""
+      "default": "Available"
     },
     "ConnectorAvailable": {
       "variable_name": "Available",

config/v2/component_config/custom/Connector_2_1.json

@@ -20,7 +20,7 @@
       ],
       "description": "This variable reports current availability state for the Connector. Optional, because already reported in StatusNotification.",
       "type": "string",
-      "default": ""
+      "default": "Available"
     },
     "ConnectorAvailable": {
       "variable_name": "Available",

config/v2/component_config/standardized/ChargingStation.json

@@ -35,7 +35,7 @@
             ],
             "description": "This variable reports current availability state for the ChargingStation",
             "type": "string",
-            "default": ""
+            "default": "Available"
         },
         "ChargingStationPhaseRotation": {
             "variable_name": "PhaseRotation",