[FIX] web: backport fix from ace.js
[FIX] web: backport fix from ace.js

Bug in ace-editor is present since that we updated in 1.3.1.
Because diff between 1.3.2 and 1.3.1 is big (-1288 +4661) with new feature...
We prefer just patch the library in stable branch applying part of commit:
https://github.com/ajaxorg/ace/commit/1890598a5da2259cfb0ceac38fed7bca582765db

To do in master? : upgrade ace.js

How to reproduce:
   > create ir.ui.view
   > be sure to empty all the content
   > type '<xpath expr=""'
   > Now if you type the > it will crash
        - Cannot read property 'type' of null

closes odoo/odoo#43955

X-original-commit: 1a90740b8e699fc3afa28c3ddb5490328facb995
Signed-off-by: Jérémy Kersten (jke) <56923a0c9ca793c07ff1df1013de5694062a27a6@openerp.com>

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