When the password file does not exist and we're making sure the user isn't in the password file, change error into a warning

Warning catches typos in the filename.  Since the playbook is saying
"make sure this user doesn't have an entry" it makes more sense to warn
than to error.

Fixes #2619

lib/ansible/modules/web_infrastructure/htpasswd.py

@@ -97,6 +97,7 @@ else:
 
 apache_hashes = ["apr_md5_crypt", "des_crypt", "ldap_sha1", "plaintext"]
 
+
 def create_missing_directories(dest):
     destpath = os.path.dirname(dest)
     if not os.path.exists(destpath):
@@ -155,9 +156,6 @@ def absent(dest, username, check_mode):
     """ Ensures user is absent
 
     Returns (msg, changed) """
-    if not os.path.exists(dest):
-        raise ValueError("%s does not exists" % dest)
-
     if StrictVersion(passlib.__version__) >= StrictVersion('1.6'):
         ht = HtpasswdFile(dest, new=False)
     else:
@@ -244,6 +242,9 @@ def main():
         if state == 'present':
             (msg, changed) = present(path, username, password, crypt_scheme, create, check_mode)
         elif state == 'absent':
+            if not os.path.exists(path):
+                module.exit_json(msg="%s not present" % username,
+                        warnings="%s does not exist" % path, changed=False)
             (msg, changed) = absent(path, username, check_mode)
         else:
             module.fail_json(msg="Invalid state: %s" % state)