prevent php-warnings, fixes #2276
Closes #2276 Merge request studip/studip!1501
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- app/views/oer/market/_material_short.php 12 additions, 26 deletionsapp/views/oer/market/_material_short.php
- app/views/oer/market/details.php 6 additions, 6 deletionsapp/views/oer/market/details.php
- lib/models/OERHostOERSI.php 3 additions, 5 deletionslib/models/OERHostOERSI.php
- lib/models/OERMaterial.php 64 additions, 5 deletionslib/models/OERMaterial.php
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