Mediaflow form reloads the page during normal usage

Problem/Motivation

While browsing the content using Mediaflow form the page reloads in unexpected moments and the error appears

1 error has been found:Mediaflow media

Steps to reproduce

On Add media item page (/media/add/mediaflow) either
1. Try to use search
2. Browse through Mediaflow folder, select a media and click Usage tab in the right panel.

Proposed resolution

Don't reload/submit the form on these actions.

Remaining tasks

User interface changes

API changes

Data model changes