Searching with "+ +" wildcards results into parseException

Reproduction path:

• Start standard hippo cms from archetype with release to 7.8.4 (-DskipTests=true)
• Start CMS and login
• Into the seachbox of the CMS do the following query:
  wat* + + wet* werk* + inkomen* naar* arbeidsvermoge*

Expected:
Two options:
A. An message in the CMS the query is not supported
B. Sanitize the query into a valid query

Result:
In the logs the following errors occur
[INFO] [talledLocalContainer] 20.08.2013 17:02:58 ERROR [org.hippoecm.frontend.plugins.standards.search.QueryResultModel.load():58] Error executing query[text]: //element(*, hippo:harddocument)[(hippo:paths = '2c21a29c-a5d1-4e84-aec4-594e5bf93b25') and (jcr:contains(.,'wat + + wet werk + inkomen naar arbeidsvermoge') or jcr:contains(.,'wat* wet* werk* inkomen* naar* arbeidsvermoge*'))]/rep:excerpt(.) order by @jcr:score descending
[INFO] [talledLocalContainer] javax.jcr.RepositoryException: Exception building query: org.apache.lucene.queryParser.ParseException: Cannot parse 'wat + + wet werk + inkomen naar arbeidsvermoge': Encountered " "" " "" at line 1, column 6.
[INFO] [talledLocalContainer] Was expecting one of:
[INFO] [talledLocalContainer] "(" ...
[INFO] [talledLocalContainer] "*" ...
[INFO] [talledLocalContainer] <QUOTED> ...
[INFO] [talledLocalContainer] <TERM> ...
[INFO] [talledLocalContainer] <PREFIXTERM> ...
[INFO] [talledLocalContainer] <WILDTERM> ...
[INFO] [talledLocalContainer] "[" ...
[INFO] [talledLocalContainer] "{" ...
[INFO] [talledLocalContainer] <NUMBER> ...
[INFO] [talledLocalContainer] <TERM> ...
[INFO] [talledLocalContainer] "*" ...
[INFO] [talledLocalContainer]
[INFO] [talledLocalContainer]
...