nazca #279606 TemporalProcessing should only be available if dateutil is installed [validation pending]

Otherwise we get a NameError.

Tests should be adapted accordingly.

prioritynormal
typebug
done in0.7.1
load0.100
load left0.000
closed by#8469e97fd36d [distances] TemporalProcessing should only be available if dateutil is installed (closes #279606)
patch[distances] TemporalProcessing should only be available if dateutil is installed (closes #279606) [applied]