ZODB Components: Do not prevent Zope from starting if pylint is not available.

Only prevent ZODB Components to be validated as the source code cannot be
checked. This does not prevent BT to be upgraded, so this should be ok.

product/ERP5Type/mixin/component.py

@@ -43,12 +43,6 @@ from zLOG import LOG, INFO
 from ExtensionClass import ExtensionClass
 from Products.ERP5Type.Utils import convertToUpperCase
 
-# Pylint imports
-from pylint.lint import Run
-from pylint.reporters.text import TextReporter
-import cStringIO
-import tempfile
-import sys
 import re
 pylint_message_re = re.compile('^(?P<type>[CRWEF]):\s*\d+,\s*\d+:\s*.*$')
 
@@ -304,6 +298,16 @@ class ComponentMixin(PropertyRecordableMixin, Base):
     if not source_code:
       return [], []
 
+    try:
+      from pylint.lint import Run
+      from pylint.reporters.text import TextReporter
+    except ImportError:
+      return ['F: Cannot check Source Code: Pylint is not available'], []
+
+    import cStringIO
+    import tempfile
+    import sys
+
     #import time
     #started = time.time()
     error_list = []