generate missing object delete bucket notifications (#10449)

fixes #10381

cmd/object-handlers.go

@@ -2739,7 +2739,11 @@ func (api objectAPIHandlers) DeleteObjectHandler(w http.ResponseWriter, r *http.
 		}
 	}
 
-	if apiErr == ErrNone {
+	if apiErr == ErrNoSuchKey {
+		writeSuccessNoContent(w)
+		return
+	}
+
 	// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectDELETE.html
 	objInfo, err := deleteObject(ctx, objectAPI, api.CacheAPI(), bucket, object, r, opts)
 	if err != nil {
@@ -2752,9 +2756,18 @@ func (api objectAPIHandlers) DeleteObjectHandler(w http.ResponseWriter, r *http.
 		// Ignore delete object errors while replying to client, since we are suppposed to reply only 204.
 	}
 	setPutObjHeaders(w, objInfo, true)
-	}
 
 	writeSuccessNoContent(w)
+
+	sendEvent(eventArgs{
+		EventName:    event.ObjectRemovedDelete,
+		BucketName:   bucket,
+		Object:       objInfo,
+		ReqParams:    extractReqParams(r),
+		RespElements: extractRespElements(w),
+		UserAgent:    r.UserAgent(),
+		Host:         handlers.GetSourceIP(r),
+	})
 }
 
 // PutObjectLegalHoldHandler - set legal hold configuration to object,