fix(Discord Node): Remove unnecessary requirement on parameters (#8060)

## Summary
The PR removes the requirement on 2 fields: the `content` and the
`description` of embeds. Discord requires neither of these fields and as
they weren't required in the v1 node, it prevents migrating to the v2
node for users not providing one of them. Discord does require
*something* to be sent however, whether an attachment, an embed or
content, so this could be used instead if necessary.

## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [x] ~~[Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.~~ (v2 is not documented)
- [x] ~~Tests included.~~ (If more complex requirements are set then a
test should be added although I haven't worked with n8n's tests before)

---------

Co-authored-by: Michael Kret <michael.k@radency.com>
Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

packages/nodes-base/nodes/Discord/v2/actions/common.description.ts

@@ -297,7 +297,7 @@ export const simplifyBoolean: INodeProperties = {
 // embeds -----------------------------------------------------------------------------------------
 const embedFields: INodeProperties[] = [
 	{
-		displayName: 'Description (Required)',
+		displayName: 'Description',
 		name: 'description',
 		type: 'string',
 		default: '',

packages/nodes-base/nodes/Discord/v2/actions/message/send.operation.ts

@@ -63,7 +63,6 @@ const properties: INodeProperties[] = [
 		name: 'content',
 		type: 'string',
 		default: '',
-		required: true,
 		description: 'The content of the message (up to 2000 characters)',
 		placeholder: 'e.g. My message',
 		typeOptions: {

packages/nodes-base/nodes/Discord/v2/helpers/utils.ts

@@ -71,6 +71,11 @@ export function parseDiscordError(this: IExecuteFunctions, error: any, itemIndex
 
 			return new NodeOperationError(this.getNode(), errorData.errors, errorOptions);
 		}
+
+		if (errorOptions.message === 'Cannot send an empty message') {
+			errorOptions.description =
+				'Something has to be send to the channel whether it is a message, an embed or a file';
+		}
 	}
 	return new NodeOperationError(this.getNode(), errorData || error, errorOptions);
 }
@@ -133,13 +138,6 @@ export function prepareEmbeds(this: IExecuteFunctions, embeds: IDataObject[], i
 				}
 			}
 
-			if (!embedReturnData.description) {
-				throw new NodeOperationError(
-					this.getNode(),
-					`Description is required, embed ${index} in item ${i} is missing it`,
-				);
-			}
-
 			if (embedReturnData.author) {
 				embedReturnData.author = {
 					name: embedReturnData.author,