david 4dd04a32a5 Make stdnse.format_output return nil when passed an empty table. Before ...

it was returning an empty string, causing blank output entries for
scripts with no output:

80/tcp    open   http
|_citrix-enum-apps-xml:
|_citrix-enum-servers-xml:
| http-headers:
|   Date: Sun, 31 Jan 2010 19:28:13 GMT
|   Server: Apache/2.2.3 (CentOS)
|   Accept-Ranges: bytes
|   Content-Length: 739
|   Connection: close
|   Content-Type: text/html; charset=UTF-8
|
|_  (Request type: HEAD)
|_http-date: Sun, 31 Jan 2010 19:28:14 GMT; +1s from local time.
|_html-title: Go ahead and ScanMe!

2010-01-31 19:38:13 +00:00

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