IC: Fix incline computation in case of zero marging.

src/Model/Geometry/Reach.py

@@ -743,7 +743,10 @@ class Reach(SQLSubModel):
         incline_acc.sort()
 
         marge = round(len(incline_acc) * 0.1)
-        incline_set = incline_acc[marge:-marge]
+        if marge > 0:
+            incline_set = incline_acc[marge:-marge]
+        else:
+            incline_set = incline_acc
 
         logger.debug(f"+{incline_acc}")
         logger.debug(f"-{incline_set}")