Plugin Support

...G...... [ZBX-25043] added config parameter validation in case of an empty value

Merge in AP/plugin-support from feature/ZBX-25043-7.1 to master

* commit '4c3e985e6a44e1255730199a3a5bf49f53aeec1a':
  ...G...... [ZBX-25043] fixed comments on errors
  ...G...... [ZBX-25043] fixed errors
  ...G...... [ZBX-25043] noemptyvalue to nonempty
  ...G...... [ZBX-25043] added config parameter validation in case of an empty value