Null value dereference [LUCENE-6628]

[asfimport]

In the file SlopQueryNode.java, the values returned getChild() and getChildren() could be null. Further operations on them could result in null pointer exceptions.

Fix by adding checks for null to the values returned by getChild() and getChildren().

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Migrated from LUCENE-6628 by Rishabh Patel, updated May 09 2016

[asfimport]

ASF GitHub Bot (migrated from JIRA)

GitHub user rmp91 opened a pull request:

https://github.com/apache/lucene-solr/pull/174

LUCENE-6628: Checking for null returned by getChild

https://issues.apache.org/jira/browse/LUCENE-6628

You can merge this pull request into a Git repository by running:

$ git pull https://github.com/rmp91/lucene-solr LUCENE-6628

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/lucene-solr/pull/174.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

This closes `#174`

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commit 3ee723ff5e142f60d1208729d1ede6939fe2d703
Author: Rishabh Patel <rishabh.mahendra.patel@gmail.com>
Date: 2015-06-27T06:16:39Z

LUCENE-6628: Checking for null returned by getChild

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