chore: don't send Content-Type header for 404 responses

See for details:
https://stackoverflow.com/questions/57399153/should-content-type-header-be-set-for-404-and-204-responses

Author: php-coder

examples/js/routes.js

@@ -9,7 +9,7 @@ app.get('/v1/categories/count', (req, res) => {
                 throw err
             }
             if (rows.length === 0) {
-                res.type('application/json').status(404).end()
+                res.status(404).end()
                 return
             }
             res.json(rows[0])
@@ -26,7 +26,7 @@ app.get('/v1/collections/:collectionId/categories/count', (req, res) => {
                 throw err
             }
             if (rows.length === 0) {
-                res.type('application/json').status(404).end()
+                res.status(404).end()
                 return
             }
             res.json(rows[0])
@@ -68,7 +68,7 @@ app.get('/v1/categories/:categoryId', (req, res) => {
                 throw err
             }
             if (rows.length === 0) {
-                res.type('application/json').status(404).end()
+                res.status(404).end()
                 return
             }
             res.json(rows[0])

src/templates/routes.js.ejs

@@ -20,7 +20,7 @@ app.get('<%- path %>', (req, res) => {
             res.json(rows)
 <% } else { -%>
             if (rows.length === 0) {
-                res.type('application/json').status(404).end()
+                res.status(404).end()
                 return
             }
             res.json(rows[0])

tests/crud.robot

@@ -26,7 +26,6 @@ GET should return a value
 GET should return not found
     ${response}=      Get Request  api  /v1/categories/100
     Status Should Be  404  ${response}
-    Should Be Equal   ${response.headers['Content-Type']}  application/json; charset=utf-8
 
 PUT should update an object
     &{payload}=       Create Dictionary  name=Fauna  nameRu=Фауна  slug=fauna  userId=1