[refactor] Scan improvements (#577)

* Handle error on unexpected barcode response

* Add ManufacturerPart detail view

* Support barcode scanning for manufacturer part

* Refactoring for null checks

* Ignore selected errors in sentry

* Fix API implementation for ManufacturerPart

* Update release notes

* More error handling

* Decode quantity betterer

* Refactoring

* Add option to confirm checkin details

* Improve response handlign

* Cleanup

* Remove unused imports

* Fix async function

* Fix for assigning custom barcode

* Handle barcode scan result for company

* Fix

* Adjust scan priority

* Refactoring MODEL_TYPE

- Use instead of duplicated const strings

* @override fix

lib/barcode/handler.dart

@@ -79,14 +79,27 @@ class BarcodeHandler {
       return;
     }
 
-    var response = await InvenTreeAPI().post(
+    APIResponse? response;
+
+    try {
+      response = await InvenTreeAPI().post(
         url,
         body: {
           "barcode": barcode,
           ...extra_data,
         },
-        expectedStatusCode: null,  // Do not show an error on "unexpected code"
-    );
+        expectedStatusCode: null, // Do not show an error on "unexpected code"
+      );
+    } catch (error, stackTrace) {
+      sentryReportError("Barcode.processBarcode", error, stackTrace);
+      response = null;
+    }
+
+    if (response == null) {
+      barcodeFailureTone();
+      showSnackIcon(L10().barcodeError, success: false);
+      return;
+    }
 
     debug("Barcode scan response" + response.data.toString());
 
@@ -94,7 +107,7 @@ class BarcodeHandler {
 
     // Handle strange response from the server
     if (!response.isValid() || !response.isMap()) {
-      onBarcodeUnknown({});
+      await onBarcodeUnknown({});
 
       showSnackIcon(L10().serverError, success: false);