Fix two coverity reports: - fAxisMin and fAxisMax were not initialised - the vector quantiles was not deleted in some cases
Fix two coverity reports:
- fAxisMin and fAxisMax were not initialised
- the vector quantiles was not deleted in some cases

gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root