title: can only concatenate list (not "unicode") to list
body: <p>I have copy pasted some Lorem Ipsum in a Word.docx file, saved it as PDF and tried to run the following script for testing purposes to extract text from a PDF.  </p>
  
  <pre><code>from pyPdf import PdfFileReader
  if (fileExtension == ".PDF"):
       pdfDoc = PdfFileReader(file(FOLDER+j, "rb"))
       fileText = ""
       print("Processing a PDF file")
       for pdfpage in range(0,pdfDoc.getNumPages()):
             fileText = fileText + pdfDoc.getPage(pdfpage).extractText()
             fileText = cleantext(fileText)
             fileText = fileText.splitlines(True)
  else:
       print("PLEASE CHOOSE A .PDF FILE")
  </code></pre>
  
  <p>It raises this particular error for any PDF file. HOWEVER!, when I run the code per line, then it does seem to work. So if I first run</p>
  
  <pre><code>      for pdfpage in range(0,pdfDoc.getNumPages()):
             fileText = fileText + pdfDoc.getPage(pdfpage).extractText()
  </code></pre>
  
  <p>then the next line, then the last line of fileText, it works. So what happens that I cannot see?</p>