Verify element exists before accessing.

Verify element exists before accessing.

Currently when the parser utility classes are outputting to a text buffer we do
not verify that an element from an array exists before accessing. We can have
null items in arrays (and dictionaries but the dictionary case is already
handled).

This Cl updates the code to check the element exists before attempting to use
the element.

BUG=chromium:641076
Committed: https://pdfium.googlesource.com/pdfium/+/c116e597ef4dfac88248d6de0e7c9bdf093b6e7c

[dsinclair, 2016-08-29 19:34:50]

dsinclair@chromium.org changed reviewers:
+ thestig@chromium.org, weili@chromium.org

[dsinclair, 2016-08-29 19:34:51]

PTAL.

[dsinclair, 2016-08-29 19:41:40]

The CQ bit was checked by dsinclair@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-29 19:41:45]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Wei Li, 2016-08-29 19:47:55]

lgtm

[commit-bot: I haz the power, 2016-08-29 20:01:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-29 20:01:25]

Dry run: This issue passed the CQ dry run.

[dsinclair, 2016-08-29 20:07:48]

The CQ bit was checked by dsinclair@chromium.org

[commit-bot: I haz the power, 2016-08-29 20:08:20]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-29 20:08:27]

Description was changed from

==========
Verify element exists before accessing.

Currently when the parser utility classes are outputting to a text buffer we do
not verify that an element from an array exists before accessing. We can have
null items in arrays (and dictionaries but the dictionary case is already
handled).

This Cl updates the code to check the element exists before attempting to use
the element.

BUG=chromium:641076
==========

to

==========
Verify element exists before accessing.

Currently when the parser utility classes are outputting to a text buffer we do
not verify that an element from an array exists before accessing. We can have
null items in arrays (and dictionaries but the dictionary case is already
handled).

This Cl updates the code to check the element exists before attempting to use
the element.

BUG=chromium:641076

Committed:
https://pdfium.googlesource.com/pdfium/+/c116e597ef4dfac88248d6de0e7c9bdf093b...
==========

[commit-bot: I haz the power, 2016-08-29 20:08:28]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/c116e597ef4dfac88248d6de0e7c9bdf093b...