Always add empty line between thread state description and details below (#3830)
Always add empty line between thread state description and details below (#3830)

In the tooltip for a thread state, the empty line between the description and
the additional details was only present when "Was blocked/created by" was also
present. Add it in all cases.

Test: Take a capture with thread state and verify several tooltip.
google/orbit,google/orbit,google/orbit,google/orbit