Search by catalog number: add integration test to check that catalogNumber is specified

[php-coder]

Create the following test:

• open a main page
• click on the Search button
• test that "Number" field has an error Value must not be empty

Requirements:

• the test should be located in the src/test/robotframework/series/search/validation.robot file

Hint:

• we can use src/test/robotframework/category/creation/validation.robot file as an example

Extracted from #340 to reduce the scope.

[mukeshk]

Do we need to add an id attribute to the search form "Search by catalog" on the html?
For the test case step :

Submit Form id=

[php-coder]

Thank you for the question!

Do we need to add an id attribute to the search form "Search by catalog" on the html?

Yes, sure. You can find the form in the src/main/webapp/WEB-INF/views/site/index.html file. Let's use search-series-form as id.

By the way, in order to locate the error message, we also will need id. I suggest to name it catalogNumber.errors

[php-coder]

@mukeshk If you work on this issue, please, assign it to yourself (and, optionally, add "in progress" label).