ParseError when searching for a space

[Mychae1]

When the user searches for a space, an error occurs.
Version tested: 8.2.2 and the z3cform branch.
It looks like it might be related to #43

The traceback:

Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 181, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 390, in publish_module
  Module ZPublisher.WSGIPublisher, line 285, in publish
  Module ZPublisher.mapply, line 85, in mapply
  Module ZPublisher.WSGIPublisher, line 68, in call_object
  Module z3c.form.form, line 233, in __call__
  Module plone.z3cform.fieldsets.extensible, line 62, in update
  Module plone.z3cform.patch, line 31, in GroupForm_update
  Module z3c.form.group, line 132, in update
  Module z3c.form.form, line 136, in updateWidgets
  Module z3c.form.contentprovider, line 65, in update
  Module collective.searchandreplace.browser.searchreplacetable, line 31, in update
  Module collective.searchandreplace.browser.searchreplacetable, line 55, in findObjects
  Module collective.searchandreplace.searchreplaceutility, line 194, in findObjects
  Module Products.CMFPlone.CatalogTool, line 429, in searchResults
  Module Products.ZCatalog.ZCatalog, line 615, in searchResults
  Module Products.ZCatalog.Catalog, line 1084, in searchResults
  Module Products.ZCatalog.Catalog, line 627, in search
  Module Products.ZCatalog.Catalog, line 557, in _search_index
  Module Products.ZCTextIndex.ZCTextIndex, line 201, in query_index
  Module Products.ZCTextIndex.QueryParser, line 155, in parseQuery
Products.ZCTextIndex.ParseTree.ParseError: Query contains only common words: '* *'