rql #8841 rql Error with OR and 'is' / TypeResolverException [open]

Requests like this:

"Any S where S is MyObj or S is CWObj"
"Any S where S attr like '%' or S is CWObj"

will generate a TypeResolverException:

File "~/src/prive/cubicweb/rql/analyze.py", line 264, in solve
  raise TypeResolverException(ex_msg)
TypeResolverException: Unable to resolve variables types in

This crash doesn't appear if attr can be interpreted as an attribute of CWObj. We should however be able to ask for objects of different type.

done in<not specified>
closed by<not specified>