Fixing item loop when undefined variable errors occur because of missing attributes

Fixes a case where the variable 'foo' may exist, but the with_items loop
was used on something like 'foo.results', where 'results' was not a valid
attribute of 'foo'. Prior to this patch, conditionals were not evaluated
until later, meaning there was no opportunity to allow a test to skip the
task or item based on it being undefined.

test/integration/roles/test_conditionals/tasks/main.yml

@@ -267,3 +267,28 @@
     that:
     - "result.changed"
 
+- name: test a with_items loop using a variable with a missing attribute
+  debug: var=item
+  with_items: foo.results
+  when: foo is defined and 'results' in foo
+  register: result
+
+- name: assert the task was skipped
+  assert:
+    that:
+    - "'skipped' in result"
+    - result.skipped
+
+- name: test a with_items loop skipping a single item
+  debug: var=item
+  with_items: items.results
+  when: item != 'b'
+  register: result
+
+- debug: var=result
+
+- name: assert only a single item was skipped
+  assert:
+    that:
+    - result.results|length == 3
+    - result.results[1].skipped

test/integration/roles/test_conditionals/vars/main.yml

@@ -0,0 +1,13 @@
+---
+# foo is a dictionary that will be used to check that
+# a conditional passes a with_items loop on a variable
+# with a missing attribute (ie. foo.results)
+foo:
+  bar: a
+
+items:
+  results:
+  - a
+  - b
+  - c
+