Python cmake: fix error when python is not found

Change-Id: Iac0b1c39fb1008593a7eb2d5c9c0f7ca18a624f5
Reviewed-on: http://gerrit.aldebaran.lan/41292
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
Tested-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
qipy: fix bootstrap on mac and windows

Change-Id: Ibafda5dde8993e5da298451ab066abe45d1d746d
Reviewed-on: http://gerrit.aldebaran.lan/41302
Reviewed-by: gschweitzer <gschweitzer@aldebaran-robotics.com>
Tested-by: gschweitzer <gschweitzer@aldebaran-robotics.com>