HS: Minor fixes.

src/View/HydraulicStructures/PlotAC.py

@@ -118,6 +118,9 @@ class PlotAC(PamhyrPlot):
 
         self.line_kp.set_data(x, z)
 
+    def clear(self):
+        self.update_clear()
+
     def update_clear(self):
         if self.line_kp is not None:
             self.line_kp.set_data([], [])

src/View/HydraulicStructures/PlotKPC.py

@@ -147,7 +147,7 @@ class PlotKPC(PamhyrPlot):
 
     def clear(self):
         if self.profile is not None:
-            self.profile.set_data([], [])
+            self.profile[0].set_data([], [])
 
         if self.line_kp_zmin_zmax is not None:
             self.line_kp_zmin_zmax.remove()