Display an error message when a Coocurrence operation goes wrong

When the stacktrace display is deactivated, and that for example there is a syntax error in a Coocurrence request, not any error message is displayed in the console.

(from redmine: issue id 315, created on 2013/08/30 by Nils Kredens)

added type::task + 1 deleted label

changed milestone to %TXM 0.X.X

An error message has been added. It is viewable whether the stacktrace display option is activated or not.

(from redmine: written on 2013/08/30 by Nils Kredens)

closed

added tool::cooccurrences label

removed milestone %TXM 0.X.X

changed milestone to %TXM 0.8.5

seams fixed

changed milestone to %TXM 0.8.4

changed title from RCP:x.x, Display an error message when a Coocurrence operation goes wrong to Display an error message when a Coocurrence operation goes wrong