Fixing key not found error

panels/fine_tune.py

@@ -18,6 +18,7 @@ class FineTune(ScreenPanel):
     bs_deltas = ["0.01","0.05"]
     percent_delta = 1
     percent_deltas = ['1','5','10','25']
+    fan = 100
 
     extrusion = 0
     speed = 0

printer.py

@@ -40,6 +40,9 @@ class Printer:
         keys = ['fan','gcode_move','idle_timeout','pause_resume','print_stats','toolhead','virtual_sdcard']
         for x in keys:
             if x in data:
+                if x not in self.data:
+                    self.data[x] = {}
+
                 for y in data[x]:
                     self.data[x][y] = data[x][y]