tests/test-commandserver.py.out

setdiscovery: return anyincoming=False when remote's only head is nullid

This fixes (issue2907) a crash when using 'hg incoming --bundle' with an empty
remote repo and a non-empty local repo.

This also fixes an unreported bug that 'hg summary --remote' erroneously
reports incoming changes when the remote repo is empty and the local is not.

Also, add a test to make sure issue2907 stays fixed

o, 'capabilities: getencoding runcommand\nencoding: ***'
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abort: unknown command unknowncommand
Mercurial Distributed SCM

basic commands:

 add        add the specified files on the next commit
 annotate   show changeset information by line for each file
 clone      make a copy of an existing repository
 commit     commit the specified files or all outstanding changes
 diff       diff repository (or selected files)
 export     dump the header and diffs for one or more changesets
 forget     forget the specified files on the next commit
 init       create a new repository in the given directory
 log        show revision history of entire repository or files
 merge      merge working directory with another revision
 pull       pull changes from the specified source
 push       push changes to the specified destination
 remove     remove the specified files on the next commit
 serve      start stand-alone webserver
 status     show changed files in the working directory
 summary    summarize working directory state
 update     update working directory (or switch revisions)

use "hg help" for the full list of commands or "hg -v" for details
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server exit code = 1
applying patch from stdin
changeset:   0:eff892de26ec
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     1

? bar
? foo/bar
bundle.mainreporoot=$TESTTMP
defaults.backout=-d "0 0"
defaults.commit=-d "0 0"
defaults.tag=-d "0 0"
ui.slash=True
ui.foo=bar
bundle.mainreporoot=$TESTTMP/foo
defaults.backout=-d "0 0"
defaults.commit=-d "0 0"
defaults.tag=-d "0 0"
ui.slash=True
hook talking
now try to read something: 'some input'
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