mir_demo_client_scroll confusingly asserts when it can't connect instead of reporting a useful error message [Assertion `mir_connection_is_valid(connection)' failed.]

[Simon THOBY]

I lauch mir_demo_client_scroll in terminal andf I obtain this :
Starting
mir_demo_client_scroll: /build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp:141: int main(int, char**): Assertion `mir_connection_is_valid(connection)' failed.
Aborted (core dumped)

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: mir-demos 0.6.1+14.10.20140814-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic x86_64
ApportVersion: 2.14.6-0ubuntu2
Architecture: amd64
AssertionMessage: mir_demo_client_scroll: /build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp:141: int main(int, char**): Assertion `mir_connection_is_valid(connection)' failed.
CurrentDesktop: Unity
Date: Sat Aug 23 10:37:47 2014
ExecutablePath: /usr/bin/mir_demo_client_scroll
InstallationDate: Installed on 2014-08-14 (8 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140813)
ProcCmdline: mir_demo_client_scroll
Signal: 6
SourcePackage: mir
StacktraceTop:
 __assert_fail_base (fmt=0x7f01ec4c98b0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x4039f8 "mir_connection_is_valid(connection)", file=file@entry=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=line@entry=141, function=function@entry=0x403b80 "int main(int, char**)") at assert.c:92
 __GI___assert_fail (assertion=0x4039f8 "mir_connection_is_valid(connection)", file=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=141, function=0x403b80 "int main(int, char**)") at assert.c:101
 main ()
SystemImageInfo: Error: [Errno 2] No such file or directory: 'system-image-cli'
Title: mir_demo_client_scroll assert failure: mir_demo_client_scroll: /build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp:141: int main(int, char**): Assertion `mir_connection_is_valid(connection)' failed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom crontab dialout dip kvm libvirtd lightdm lpadmin lxc-dnsmasq messagebus operator plugdev sambashare saned ssh sudo users uucp video

[Apport retracing service (apport)]

StacktraceTop:
 __assert_fail_base (fmt=0x7f01ec4c98b0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x4039f8 "mir_connection_is_valid(connection)", file=file@entry=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=line@entry=141, function=function@entry=0x403b80 <main::__PRETTY_FUNCTION__> "int main(int, char**)") at assert.c:92
 __GI___assert_fail (assertion=0x4039f8 "mir_connection_is_valid(connection)", file=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=141, function=0x403b80 <main::__PRETTY_FUNCTION__> "int main(int, char**)") at assert.c:101
 main (argc=<optimized out>, argv=0x7fff46206488) at /build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp:141