fixed tests without AFNI installation

Author: oesteban

nipype/interfaces/afni/base.py

@@ -38,8 +38,13 @@ def version():
 
         """
         import re
-        clout = CommandLine(command='afni_vcheck',
-                            terminal_output='allatonce').run()
+        try:
+            clout = CommandLine(command='afni_vcheck',
+                                terminal_output='allatonce').run()
+        except IOError:
+            # If afni_vcheck is not present, return None
+            return None
+
         out = clout.runtime.stdout.split('\n')[1]
 
         # Try to parse the version number
@@ -173,3 +178,10 @@ def _list_outputs(self):
                     if ext == "":
                         outputs[name] = outputs[name] + "+orig.BRIK"
         return outputs
+
+
+def no_afni():
+    """ Checks if AFNI is available """
+    if Info.version() is None:
+        return True
+    return False

nipype/interfaces/afni/preprocess.py

@@ -1236,13 +1236,17 @@ class SkullStrip(AFNICommand):
     output_spec = AFNICommandOutputSpec
 
     def __init__(self, **inputs):
-        from .base import Info
+        from .base import Info, no_afni
         super(SkullStrip, self).__init__(**inputs)
-        v = Info.version()
 
-        # As of AFNI 16.0.00, redirect_x is not needed
-        if isinstance(v[0], int) and v[0] > 15:
-            self._redirect_x = False
+        if not no_afni():
+            v = Info.version()
+
+            # As of AFNI 16.0.00, redirect_x is not needed
+            if isinstance(v[0], int) and v[0] > 15:
+                self._redirect_x = False
+        else:
+            raise RuntimeWarning('afni_vcheck executable not found.')
 
 
 class TCatInputSpec(AFNICommandInputSpec):