Reading PDF using PyPDF2 not resulting anything

Here is my code – courtesy – http://code.activestate.com/recipes/511465-pure-python-pdf-to-text-converter/ .
I modified it to include next version of PyPDF.

import PyPDF2

def getPDFContent(path):
    content = ""
    # Load PDF into pyPDF
    pdf = PyPDF2.PdfFileReader(file(path, "rb"))
    # Iterate pages
    print "Number of pages is ", pdf.getNumPages()

    for i in range(0, pdf.getNumPages()):
        # Extract text from page and add to content
        content += pdf.getPage(i).extractText() + "n"
        print (content)

    # Collapse whitespace
    content = " ".join(content.replace(u"xa0", " ").strip().split())
    return content

print getPDFContent("RL.pdf").encode("ascii", "xmlcharrefreplace")

The file I am reading is here.
http://dmc.kar.nic.in/RL.pdf

All I get is this.

Number of pages is 1
Blank after this.

Is this a problem with the PDF or am I going wrong somewhere?
All help appreciated!