fix picket fence gui new mlc class

pylinac/py_gui.py

@@ -133,6 +133,9 @@ def analyze_pf():
         self.pf_pickets = IntVar(value=10)
         self.pf_pdf = StringVar()
         self.pf_mlc = StringVar()
+        mlc_list = []
+        for mlc in picketfence.MLC:
+            mlc_list.append(mlc.value.get('name'))
         Checkbutton(self.pf_tab, text='Apply median filter', variable=self.pf_filter).grid(column=1, row=3)
         Button(self.pf_tab, text='Load File...', command=load_file).grid(column=1, row=1)
         Label(self.pf_tab, text='File:').grid(column=1, row=2)
@@ -144,7 +147,7 @@ def analyze_pf():
         Label(self.pf_tab, text='Number of pickets:').grid(column=1, row=6)
         Entry(self.pf_tab, width=7, textvariable=self.pf_pickets).grid(column=2, row=6)
         Label(self.pf_tab, text='MLC type:').grid(column=1, row=7)
-        Combobox(self.pf_tab, values=list(picketfence.MLCs.keys()), textvariable=self.pf_mlc, state='readonly').grid(column=2, row=7)
+        Combobox(self.pf_tab, values=mlc_list, textvariable=self.pf_mlc, state='readonly').grid(column=2, row=7)
         Button(self.pf_tab, text='Analyze', command=analyze_pf).grid(column=1, row=8)
         Label(self.pf_tab, text='Analysis will analyze the file according to the settings, \nsave a PDF in the same directory as the original file location and then open it.').grid(column=1, row=9)
         self.notebook.add(self.pf_tab, text='Picket Fence')