CRM-13324 fix

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* CRM-13324: Reserve respondent process of survey not working if contacts are filter by particular group, and all records are selected for reserving.
  http://issues.civicrm.org/jira/browse/CRM-13324
CRM-13324 : code improvement

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* CRM-13324: Reserve respondent process of survey not working if contacts are filter by particular group, and all records are selected for reserving.
  http://issues.civicrm.org/jira/browse/CRM-13324
Merge pull request #1579 from pratik-joshi/CRM-13324

Crm 13324