prevent error in strict mode and php warnings, fixes #4902
Closes #4902 Merge request studip/studip!3676
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- app/controllers/massmail/message.php 1 addition, 1 deletionapp/controllers/massmail/message.php
- lib/classes/forms/Form.php 3 additions, 3 deletionslib/classes/forms/Form.php
- lib/classes/forms/RadioInput.php 1 addition, 1 deletionlib/classes/forms/RadioInput.php
- templates/forms/radio_input.php 12 additions, 1 deletiontemplates/forms/radio_input.php
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