fix: Remove all instances of return undefined

Resolves #26

src/ldp/http/AcceptPreferenceParser.ts

@@ -20,7 +20,7 @@ export class AcceptPreferenceParser extends PreferenceParser {
   }
 
   public async canHandle(): Promise<void> {
-    return undefined;
+    // Supports all HttpRequests
   }
 
   public async handle(input: HttpRequest): Promise<RepresentationPreferences> {

src/ldp/http/SimpleBodyParser.ts

@@ -32,7 +32,7 @@ export class SimpleBodyParser extends BodyParser {
     const contentType = input.headers['content-type'];
 
     if (!contentType) {
-      return undefined;
+      return;
     }
 
     const mediaType = contentType.split(';')[0];