Seal "NotConnected" usage

When media is disconnected, "NotConnected" field did not exist. This
change adds default value of this field for all code paths.

Tested:
curl -X GET https://some_addr/redfish/v1/Managers/bmc/VirtualMedia/Legacy
{
  "@odata.id": "/redfish/v1/Managers/bmc/VirtualMedia/Legacy",
  "@odata.type": "#VirtualMedia.v1_3_0.VirtualMedia",
  "Actions": {
    "#VirtualMedia.EjectMedia": {
      "target": "/redfish/v1/Managers/bmc/VirtualMedia/Legacy/Actions/VirtualMedia.EjectMedia"
    },
    "#VirtualMedia.InsertMedia": {
      "target": "/redfish/v1/Managers/bmc/VirtualMedia/Legacy/Actions/VirtualMedia.InsertMedia"
    }
  },
  "ConnectedVia": "NotConnected",
  "Id": "Legacy",
  "Inserted": false,
  "MediaTypes": [
    "CD",
    "USBStick"
  ],
  "Name": "Virtual Removable Media",
  "Oem": {
    "OpenBMC": {
      "@odata.type": "#OemVirtualMedia.v1_0_0.VirtualMedia"
    }
  },
  "TransferMethod": "Stream",
  "WriteProtected": true
}

Change-Id: I5e0789947e092907abe1bc353aebc07a4fb87274
Signed-off-by: Przemyslaw Czarnowski <przemyslaw.hawrylewicz.czarnowski@intel.com>
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/redfish-core/lib/virtual_media.hpp b/redfish-core/lib/virtual_media.hpp
index 2e632f8..405de77 100644
--- a/redfish-core/lib/virtual_media.hpp
+++ b/redfish-core/lib/virtual_media.hpp
@@ -18,6 +18,7 @@
 #include "account_service.hpp"
 #include "app.hpp"
 #include "dbus_utility.hpp"
+#include "generated/enums/virtual_media.hpp"
 #include "query.hpp"
 #include "registries/privilege_registry.hpp"
 #include "utils/json_utils.hpp"
@@ -158,7 +159,8 @@
                         aResp->res.jsonValue["TransferProtocolType"] =
                             getTransferProtocolTypeFromUri(*imageUrlValue);
 
-                        aResp->res.jsonValue["ConnectedVia"] = "URI";
+                        aResp->res.jsonValue["ConnectedVia"] =
+                            virtual_media::ConnectedVia::URI;
                     }
                 }
                 if (property == "WriteProtected")
@@ -188,7 +190,8 @@
 
                     if (*activeValue)
                     {
-                        aResp->res.jsonValue["ConnectedVia"] = "Applet";
+                        aResp->res.jsonValue["ConnectedVia"] =
+                            virtual_media::ConnectedVia::Applet;
                     }
                 }
             }
@@ -210,6 +213,7 @@
     item["Name"] = "Virtual Removable Media";
     item["Id"] = resName;
     item["WriteProtected"] = true;
+    item["ConnectedVia"] = virtual_media::ConnectedVia::NotConnected;
     item["MediaTypes"] = nlohmann::json::array_t({"CD", "USBStick"});
     item["TransferMethod"] = "Stream";
     item["Oem"]["OpenBMC"]["@odata.type"] =