Stop Fail500 and LogError from panicing with nil request or error

internal/helper/helpers.go

@@ -19,12 +19,18 @@ const NginxResponseBufferHeader = "X-Accel-Buffering"
 func Fail500(w http.ResponseWriter, r *http.Request, err error) {
 	http.Error(w, "Internal server error", 500)
-	captureRavenError(r, err)
+	if err != nil {
+		captureRavenError(r, err)
+	}
+
 	printError(r, err)
 }
 func LogError(r *http.Request, err error) {
-	captureRavenError(r, err)
+	if err != nil {
+		captureRavenError(r, err)
+	}
+
 	printError(r, err)
 }

internal/helper/helpers_test.go

@@ -99,3 +99,14 @@ func TestApplicationJson(t *testing.T) {
 	req.Header.Set("Content-Type", "text/plain")
 	assert.False(t, IsApplicationJson(req), "expected not to match 'text/plain' as 'application/json'")
 }
+
+func TestFail500WorksWithNils(t *testing.T) {
+	body := bytes.NewBuffer(nil)
+	w := httptest.NewRecorder()
+	w.Body = body
+
+	Fail500(w, nil, nil)
+
+	assert.Equal(t, http.StatusInternalServerError, w.Code)
+	assert.Equal(t, "Internal server error\n", body.String())
+}