Error on resolving response data from getPreset()

[scaret]

For my camera, when there's only 1 preset or even no preset, the result of linerase(data).getPresetsResponse.preset (in ptz.js, line 32) will not be an array(instead, its an empty string for 0, and an object for 1), thus no forEach method.

TypeError: undefined is not a function
    at null.<anonymous> (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\lib\ptz.js:33:45)
    at C:\Users\Derek\temp\camera-onvif\node_modules\onvif\lib\utils.js:86:5
    at Parser.<anonymous> (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\lib\xml2js.js:432:18)
    at Parser.emit (events.js:107:17)
    at Object.onclosetag (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\lib\xml2js.js:401:26)
    at emit (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\node_modules\sax\lib\sax.js:615:33)

    at emitNode (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\node_modules\sax\lib\sax.js:620
:3)
    at closeTag (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\node_modules\sax\lib\sax.js:861
:5)
    at Object.write (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js\node_modules\sax\lib\sax.js
:1294:29)
    at Parser.exports.Parser.Parser.parseString (C:\Users\Derek\temp\camera-onvif\node_modules\onvif\node_modules\xml2js
\lib\xml2js.js:451:31)

[agsh]

Fixed this in github master version