Collect jq/JBOL documentation oddities

[sshine]

The following are mainly observations about the jq documentation in JBOL, but is open to collect any oddity, discrepancy or digression in the documentation that helps a jq implementer.

• JBOL: Schematic syntax for special constructs mentions an if ... then ... end without an else part, but this does not work:

  $ jq -n 'if 1 then 2 end' 
  jq: error: syntax error, unexpected end (Unix shell quoting issues?) at <top-level>, line 1:
  if 1 then 2 end            
  jq: error: Possibly unterminated 'if' statement at <top-level>, line 1:
  if 1 then 2 end
  jq: 2 compile errors
  

  At the same time, JBOL's language grammar does not allow it.