Fix random failure on invalid query in ITSearchTabTest.testSearch

Unexpected modal dialog (text: Error while querying data from server: error): Error while querying data from server: error
Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 17:00:58'
System info: host: 'b1fe94115fbe', ip: '172.17.0.11', os.name: 'Linux', os.arch: 'amd64', os.version: '4.4.0-24-generic', java.version: '1.8.0_77'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=42.0, platform=LINUX, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 28a503bd-cd35-48b2-a4e1-199700c5edfb

Caused by: org.nuxeo.ecm.automation.OperationException: Failed to execute query: SELECT * FROM Document WHERE dc:title ILIKE 'jdoe%' AND ecm:mixinType = 'Collection' AND (ecm:primaryType != 'Favorites' OR (ecm:primaryType = 'Favorites' AND dc:creator = 'ORDER BY dc:title, Syntax error: Invalid token <null> at offset -1

    <coreQueryPageProvider name="default_collection">
      <property name="maxResults">PAGE_SIZE</property>
      <pattern quoteParameters="false" escapeParameters="true">
        SELECT * FROM Document WHERE dc:title ILIKE '?%' AND ecm:mixinType = 'Collection' AND
        (ecm:primaryType != 'Favorites' OR (ecm:primaryType = 'Favorites' AND dc:creator = '?')) AND
        ecm:isProxy = 0 AND ecm:mixinType != 'HiddenInNavigation' AND
        ecm:isCheckedInVersion = 0 AND ecm:currentLifeCycleState != 'deleted'
      </pattern>
      <parameter>#{currentUser.name}</parameter>
      <sort column="dc:title" ascending="true" />
      <pageSize>50</pageSize>
    </coreQueryPageProvider>