SUMMARY
Symbols viewer misses Ruby functions without parenthesis in their definition line.

STEPS TO REPRODUCE
In Ruby, function definitions don't require parenthesis.  The symbol viewer omits these function names.
For example, 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class Gtest

  def initialize()
  end

  def test2(p1, p2)
  end

  def no_paren_function
    puts 'aaaaa'
  end

end
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The symbol viewer will show 'initialize' and 'test2' but not 'no_paren_function'.

OBSERVED RESULT
The  'no_paren_function' will not be shown in the Symbols pane.

EXPECTED RESULT
The  'no_paren_function' should be shown in the Symbols pane.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE 15.5 
(available in About System)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
In previous versions of Kate, the symbol viewer worked correctly for this case.