Added option to run KLFitter even with uncalibrated WP when kNotag is used
Previously the code would crash when KLFitter tried to access the b-tagging efficiency for WPs that do not have calibrations.
Modified the code to only access the btagging efficiency information only when it is actually needed (
Also removed trailing whitespaces. Related JIRA: ANALYSISTO-776
Tagging @kzoch so he can have a look.