+++ This bug was initially created as a clone of Bug #1002403 +++

Description of problem:
`gluster volume status all --xml` returns wrong xml output when a gluster volume is down.

How reproducible:
Run `gluster volume status all --xml` with all volumes in UP state and run again with any one volume is DOWN.

Steps to Reproduce:
1. With all volumes in UP state, run `gluster volume status all --xml` and note the CLI output
2. With any one volume in DOWN state and run `gluster volume status all --aml` and note CLI output

Actual results: (Example only)
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cliOutput>
  <opRet>-1</opRet>
  <opErrno>0</opErrno>
  <opErrstr>Volume v1 is not started</opErrstr>
  <cliOp>volStatus</cliOp>
  <output>Volume v1 is not started</output>
</cliOutput>
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cliOutput>
  <opRet>0</opRet>
  <opErrno>0</opErrno>
  <opErrstr>(null)</opErrstr>
  <volStatus>
    <volumes>
      <volume>
        <volName>dv1</volName>
        <nodeCount>4</nodeCount>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb1</path>
          <status>1</status>
          <port>49156</port>
          <pid>11341</pid>
        </node>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb2</path>
          <status>1</status>
          <port>49157</port>
          <pid>11351</pid>
        </node>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb3</path>
          <status>0</status>
          <port>N/A</port>
          <pid>27642</pid>
        </node>
        <node>
          <hostname>NFS Server</hostname>
          <path>localhost</path>
          <status>0</status>
          <port>N/A</port>
          <pid>-1</pid>
        </node>
        <tasks>
          <task>
            <type>Rebalance</type>
            <id>c2a76e0b-099d-4879-a53e-f1ea61d67a50</id>
            <status>3</status>
          </task>
        </tasks>
      </volume>
    </volumes>
  </volStatus>
</cliOutput>


Expected results: (Example)
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cliOutput>
  <opRet>0</opRet>
  <opErrno>0</opErrno>
  <opErrstr>(null)</opErrstr>
  <volStatus>
    <volumes>
      <volume>
        <volName>dv1</volName>
        <nodeCount>4</nodeCount>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb1</path>
          <status>1</status>
          <port>49156</port>
          <pid>11341</pid>
        </node>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb2</path>
          <status>1</status>
          <port>49157</port>
          <pid>11351</pid>
        </node>
        <node>
          <hostname>10.70.42.152</hostname>
          <path>/brcks/dvb3</path>
          <status>0</status>
          <port>N/A</port>
          <pid>27642</pid>
        </node>
        <node>
          <hostname>NFS Server</hostname>
          <path>localhost</path>
          <status>0</status>
          <port>N/A</port>
          <pid>-1</pid>
        </node>
        <tasks>
          <task>
            <type>Rebalance</type>
            <id>c2a76e0b-099d-4879-a53e-f1ea61d67a50</id>
            <status>3</status>
          </task>
        </tasks>
      </volume>
    </volumes>
  </volStatus>
</cliOutput>