Frictions: Fix plot drawing crash.

src/View/Frictions/PlotStricklers.py

@@ -16,6 +16,8 @@
 
 # -*- coding: utf-8 -*-
 
+import logging
+
 from tools import timer, flatten
 from View.Tools.PamhyrPlot import PamhyrPlot
 
@@ -23,13 +25,20 @@ from PyQt5.QtCore import (
     QCoreApplication
 )
 
+logger = logging.getLogger()
+
 _translate = QCoreApplication.translate
 
 
 class PlotStricklers(PamhyrPlot):
     def draw_frictions(self, frictions, color="r"):
-        lst = frictions
-        lst.sort(key=lambda s: s.begin_kp)
+        lst = sorted(
+            filter(
+                lambda f: f.is_full_defined(),
+                frictions
+            ),
+            key=lambda s: s.begin_kp
+        )
 
         coef = flatten(
             map(