[RM-8207] Fix Sonar alerte

Created on 2023-08-09 09:16:06 by Pierre-yves Chabaud. % Done: 100

In @abstractfitter.cpp@ (release 0.42.0), Sonar raises an alert on line 383.

with the following message :

<pre>
Identical inner 'if' condition is always true (outer condition is 'x' and inner condition is 'x').
</pre>