Catch errors when parsing the linearization header so we can display corrupted docs

src/core.js

@@ -398,11 +398,17 @@ var PDFDocument = (function PDFDocumentClosure() {
     get linearization() {
       var length = this.stream.length;
       var linearization = false;
+      try {
         if (length) {
           linearization = new Linearization(this.stream);
           if (linearization.length != length)
             linearization = false;
         }
+      } catch (err) {
+        warn('since pdf is broken pdf.js is trying to recover it ' +
+             'by indexing the object; ' +
+             'the error in firebug shall have a different origin');
+      }
       // shadow the prototype getter with a data property
       return shadow(this, 'linearization', linearization);
     },