Clean up some more import statements

gui/chromeTabs.py

@@ -1127,8 +1127,9 @@ class PFTabsContainer(wx.Panel):
             color = wx.Colour(0, 0, 0)
             brush = wx.Brush(color)
 
-            # noinspection PyPackageRequirements
+            # noinspection PyPackageRequirements,PyUnresolvedReferences,PyUnresolvedReferences,PyUnresolvedReferences
             from Carbon.Appearance import kThemeBrushDialogBackgroundActive
+            # noinspection PyUnresolvedReferences
             brush.MacSetTheme(kThemeBrushDialogBackgroundActive)
         else:
             color = wx.SystemSettings_GetColour(wx.SYS_COLOUR_3DFACE)

gui/graphFrame.py

@@ -59,7 +59,7 @@ class GraphFrame(wx.Frame):
             from matplotlib.figure import Figure
             enabled = True
         except ImportError:
-            mpl = Canvas = Figure = None
+            matplotlib = mpl = FigureCanvasWxAgg = Canvas = Figure = None
             enabled = False
 
         self.legendFix = False

pyfa.py

@@ -59,6 +59,7 @@ if not hasattr(sys, 'frozen'):
     try:
         import wxversion
     except ImportError:
+        wxversion = None
         print("Cannot find wxPython\nYou can download wxPython (2.8+) from http://www.wxpython.org/")
         sys.exit(1)
 
@@ -89,6 +90,7 @@ if not hasattr(sys, 'frozen'):
             print("Unknown sqlalchemy version string format, skipping check")
 
     except ImportError:
+        sqlalchemy = None
         print("Cannot find sqlalchemy.\nYou can download sqlalchemy (0.6+) from http://www.sqlalchemy.org/")
         sys.exit(1)
 
@@ -97,6 +99,7 @@ if not hasattr(sys, 'frozen'):
         # noinspection PyPackageRequirements
         import dateutil.parser  # noqa - Copied import statement from service/update.py
     except ImportError:
+        dateutil = None
         print("Cannot find python-dateutil.\nYou can download python-dateutil from https://pypi.python.org/pypi/python-dateutil")
         sys.exit(1)