Commits on Nov 8, 2015

1. Improve error message for non-existent local files …

   I received multiple reports about the following cryptic error in the
   Chrome extension when the user tried to open a local file:
   
   > PDF.js v1.1.527 (build: 2096a2a)
   > Message: Cannot read property 'Symbol(Symbol.iterator)' of null
   
   This error most likely originated from core/stream.js:
   
       function Stream(arrayBuffer, start, length, dict) {
         this.bytes = (arrayBuffer instanceof Uint8Array ?
                       arrayBuffer : new Uint8Array(arrayBuffer));
                                                    ^^^^^^^^^^^
   `arrayBuffer` is `null`, and that in turn is caused by the fact that
   for non-existing files, there is no data. I've applied two fixes:
   
   1. Never call onDone with a void buffer, but call the error handler
      instead.
   2. Show a sensible error message for local files with status = 0.

   

   Rob--W committed Nov 8, 2015
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