minor improvements to error reporting

Author: Shoshana Berleant

nipype/algorithms/rapidart.py

@@ -362,7 +362,10 @@ def _detect_outliers_core(self, imgfile, motionfile, runidx, cwd=None):
                 nim = funcs.concat_images(images)
 
         # compute global intensity signal
-        (x, y, z, timepoints) = nim.shape
+        try:
+            (x, y, z, timepoints) = nim.shape
+        except ValueError as ve:
+            raise NipypeInterfaceError(ve, 'Check dimensions of input image; 4-D input required.')
 
         data = nim.get_data()
         affine = nim.affine

nipype/interfaces/base.py

@@ -1056,7 +1056,7 @@ def run(self, **inputs):
 
             if config.has_option('logging', 'interface_level') and \
                     config.get('logging', 'interface_level').lower() == 'debug':
-                inputs_str = "Inputs:" + str(self.inputs) + "\n"
+                inputs_str = "\nInputs:" + str(self.inputs) + "\n"
             else:
                 inputs_str = ''