move package test to after packages are imported

Author: briantoby

GSASII/GSASIIdataGUI.py

@@ -480,6 +480,10 @@ def ShowVersions():
         print('Warning: Python requests package not installed (required for\n'+
               ' GSAS-II to access web pages or self-install binary modules)')
         G2fil.NeededPackage({'Accessing web resources':['requests']})
+    try:
+        import pybaselines.whittaker
+    except:
+        G2fil.NeededPackage({'Auto background capability':['pybaselines']})
 
     if not GSASIIpath.TestSPG():
         path2repo = os.path.dirname(GSASIIpath.path2GSAS2)

GSASII/GSASIIpwd.py

@@ -32,6 +32,7 @@
 from . import GSASIIspc as G2spc
 from . import GSASIIElem as G2elem
 from . import GSASIImath as G2mth
+from . import GSASIIfiles as G2fil
 try:
     if GSASIIpath.binaryPath:
         import  pypowder as pyd
@@ -46,13 +47,6 @@
         from . import pydiffax as pyx
 except ImportError:
     print ('pydiffax is not available for this platform')
-from . import GSASIIfiles as G2fil
-try:
-    import pybaselines.whittaker
-except:
-    G2fil.NeededPackage({'Auto background capability':['pybaselines']})
-
-
 
 # trig functions in degrees
 tand = lambda x: math.tan(x*math.pi/180.)