BUG: matplotlib is supposed to be optional

This code was failing to find matplotlib and
the first import was silently continuing, but
then the second call that requires matplotlib
began failing.

Author: hjmjohnson

nipype/pipeline/plugins/base.py

@@ -112,11 +112,15 @@ def create_pyscript(node, updatehash=False, store_exception=True):
     # create python script to load and trap exception
     cmdstr = """import os
 import sys
+
+can_import_matplotlib = True #Silently allow matplotlib to be ignored
 try:
     import matplotlib
     matplotlib.use('%s')
 except ImportError:
+    can_import_matplotlib = False
     pass
+
 from nipype import config, logging
 from nipype.utils.filemanip import loadpkl, savepkl
 from socket import gethostname
@@ -130,7 +134,9 @@ def create_pyscript(node, updatehash=False, store_exception=True):
         from collections import OrderedDict
     config_dict=%s
     config.update_config(config_dict)
-    config.update_matplotlib()
+    ## Only configure matplotlib if it was successfully imported, matplotlib is an optional component to nipype
+    if can_import_matplotlib:
+        config.update_matplotlib()
     logging.update_logging(config)
     traceback=None
     cwd = os.getcwd()