Prevent "Saved data" view from raising an exception if a field is not…

… found. fixes gh-381

news/381.bugfix

@@ -0,0 +1,2 @@
+Prevent "Saved data" view from raising an exception if a field is not found
+[frapell]

src/collective/easyform/browser/actions.py

@@ -47,8 +47,10 @@
 from zope.publisher.interfaces.browser import IBrowserRequest
 from zope.schema import getFieldsInOrder
 from ZPublisher.BaseRequest import DefaultPublishTraverse
+import logging
 
 
+logger = logging.getLogger(__name__)
 PMF = MessageFactory("plone")
 
 
@@ -141,7 +143,18 @@ def update_schema(self):
         fields = field.Fields(self.get_schema)
         showFields = getattr(self.field, "showFields", [])
         if showFields:
-            fields = fields.select(*showFields)
+            # showFields is a fixed list of field ids, and if those ids are no
+            # longer there, you get an exception, so first filter them.
+            existingFields = []
+            for fid in showFields:
+                if fid not in fields:
+                    logger.warning(
+                        "Field '%s' is no longer present in the form %s. Ignoring." %
+                        (fid, '/'.join(self.context.getPhysicalPath()))
+                    )
+                else:
+                    existingFields.append(fid)
+            fields = fields.select(*existingFields)
         return fields
 
     @property