Public Event Pages: Speakers Page Link even though No Speakers are Visible on Page

[mariobehling]

There is a speakers page on some events even if there is no speaker defined, e.g. compare https://eventyay.com/e/5ac8e4d9/speakers and https://eventyay.com/e/c310c6ba.

Expected:

• Only show "Speaker Link" if speakers are defined
• Only show speaker page once accepted or confirmed sessions exist.