Error-catching; first line of .pocket-index

[uriel1998]

Somehow the first line of .pocket-index - url,reading_time,id,word_count,title - disappeared from the file, and the program kept crashing. An error catch to discover if the first line is what we expect (and perhaps even write it to the file if it's not there) would be helpful (and saved me a couple of hours!)

[rakanalh]

This sounds like a good idea. I'll see what i can do with this.