fixed version checking

Author: chrisgorgo

nipype/interfaces/fsl/model.py

@@ -597,7 +597,7 @@ class FILMGLS(FSLCommand):
 
     _cmd = 'film_gls'
 
-    if LooseVersion(Info.version()) > LooseVersion('5.0.4'):
+    if Info.version() and LooseVersion(Info.version()) > LooseVersion('5.0.4'):
         input_spec = FILMGLSInputSpec505
     else:
         input_spec = FILMGLSInputSpec