fix: remove flag from normalize

Author: satra

nipype/interfaces/spm/preprocess.py

@@ -544,7 +544,7 @@ class Normalize12InputSpec(SPMCommandInputSpec):
                             desc='FWHM of Gaussian smoothness of bias')
     tpm = File(exists=True, field='eoptions.tpm',
                desc='template in form of tissue probablitiy maps to normalize to',
-               mandatory=False, xor=['deformation_file'],
+               xor=['deformation_file'],
                copyfile=False)
     affine_regularization_type = traits.Enum('mni', 'size', 'none',
                                              field='eoptions.affreg',

nipype/interfaces/spm/tests/test_auto_Normalize12.py

@@ -37,7 +37,6 @@ def test_Normalize12_inputs():
     ),
     tpm=dict(copyfile=False,
     field='eoptions.tpm',
-    mandatory=False,
     xor=['deformation_file'],
     ),
     use_mcr=dict(),