cob_linear_nav: initialize variable and add assertions
cob_linear_nav: change assert to try-catch to check that in all modes
cob_linear_nav: now hopefully really found the bug; ros::Time::now()-1 = verybig
cob_linear_nav: change order of nan and high velocity check to catch them with correct error msg
cob_linear_nav: initialize some more variables, check if received goal has invalid Quaternion
cob_linear_nav: fix indentation
Merge pull request #1 from ipa-mig/feature/baer_error_control

linear nav fixes