paths: use single loop for both search=None|pattern cases This will help porting to the formatter API. This patch adds test for empty pathitems to make sure "hg paths" never say "not found!".

paths: reorder else clause for readability of subsequent patches This prepares for porting to the formatter API. Future patches will use a single loop to handle both search=None|pattern cases because formatter output should be the same. "pathitems" will be switched instead.

paths: drop ui.status label from output of "hg paths name" We just need to not print path if --quiet. ui.status label is unwanted.

unionrepo: fix wrong rev being checked in iscensored (issue5024)

summary: print unstable, bumped and divergent as unconditionally plural This aligns with the unconditional plural output for the update line contents, as well as the incoming/outgoing bookmarks line. It also matches the message in evolve's summary hook as of 4f83b2d2d20d. (Though I thought this was removed recently?)

debugshell: disable demand importer when importing debugger For reasons I can't explain (but likely have something to do with a combination of __import__ inferring default values for arguments and the demand importer mechanism further assuming defaults), the demand importer isn't playing well with IPython. Without this patch, we get a failure "ValueError: Attempted relative import in non-package" when attempting to import "IPython." The stack has numerous demandimport calls on it and adding "IPython" to the exclude list in demandimport isn't enough to make the problem go away, which means the issue is likely somewhere in the bowells of IPython. It's easier to just disable the demand importer when importing the debugger.