replaced RuntimeWarning by nipype warning

Author: oesteban

nipype/interfaces/afni/base.py

@@ -43,6 +43,7 @@ def version():
                                 terminal_output='allatonce').run()
         except IOError:
             # If afni_vcheck is not present, return None
+            warn('afni_vcheck executable not found.')
             return None
 
         out = clout.runtime.stdout.split('\n')[1]

nipype/interfaces/afni/preprocess.py

@@ -1245,8 +1245,6 @@ def __init__(self, **inputs):
             # 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):