No failed backend requests A duplicate of #1188
I think it better to use `SchemaType.PROTOBUF` from `import { SchemaType } from 'generated-sources';
` instead of hardcoded value
Empty screen if try to Edit schema of proto type
**Describe the bug**
(A clear and concise description of what the bug is.)

There is an empty screen when you try to edit the schema of proto type.

**Set up**
(How do you run the app? 
Which version of the app are you running? Provide either docker image version or check commit hash at the top left corner. We won't be able to help you without this information.)

http://dependabot-npm-and-yarn-kafka-ui.internal.kafka-ui.provectus.io/
**Steps to Reproduce**
Steps to reproduce the behavior:

1. Navigate to Schema Registry 
2. Click the schema with a name containing 'proto'
3. Press the button Edit Schema
4. Observe the empty screen with the right URL (see attachment)

**Expected behavior**
(A clear and concise description of what you expected to happen)
Edit screen for the schema.
**Screenshots**
(If applicable, add screenshots to help explain your problem)

![image](https://user-images.githubusercontent.com/92585878/149402931-43117037-cb89-4716-82c2-ffef381b4f60.png)

**Additional context**
(Add any other context about the problem here)
Works correctly for other schema types.
kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx
kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx
diff --git a/kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx b/kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx
index 63a48580dca..27a109f0238 100644
--- a/kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx
+++ b/kafka-ui-react-app/src/components/Schemas/Edit/Edit.tsx
@@ -37,10 +37,11 @@ const Edit: React.FC = () => {
 
   const schema = useAppSelector((state) => selectSchemaById(state, subject));
 
-  const formatedSchema = React.useMemo(
-    () => JSON.stringify(JSON.parse(schema?.schema || '{}'), null, '\t'),
-    [schema]
-  );
+  const formatedSchema = React.useMemo(() => {
+    return schema?.schemaType === SchemaType.PROTOBUF
+      ? schema?.schema
+      : JSON.stringify(JSON.parse(schema?.schema || '{}'), null, '\t');
+  }, [schema]);
 
   const onSubmit = React.useCallback(async (props: NewSchemaSubjectRaw) => {
     if (!schema) return;
