IC, BC: Fix end_strickler deletion.

src/Model/Geometry/Reach.py

@@ -840,6 +840,9 @@ class Reach(SQLSubModel):
             z_last = profile.z_min()
             rk_last = profile.rk
 
+            if (rk_last - rk_first) == 0:
+                continue
+
             incline_acc += [
                 (z_last - z_first)
                 /