Webform of Main topic performs some checks for "context" and decides what info is to be placed into the field "Category". In some cases "Category" remains empty.This doesn't affect functionality until… the second category is added to forum. Since that, we have problems accessing topics with empty categories.

My ideas are:

• non-categorized topics should be appended to ALL categories in views;
  
• if exactly 1 category is defined, ALL topics should become categorized to it by default