Some receipts don't timeout, tool hangs

[rahensonzam]

Version
v1.11.0

Describe the bug
When downloading payment receipts, on a certain client the tool hangs on "Downloading generated HMTL" for one or more receipts and they do not timeout or error and the tool doesn't continue.
This means you can't use the retrying feature.

It might happen more when there is poor site connection.

I don't know if it happens with the other actions.

To Reproduce
Steps to reproduce the behavior:

1. Load clients.
2. Run "Get payment receipts", maybe several times.
3. The tool stops on "Downloading generated HMTL".
4. It does not continue.

Expected behavior
If certain receipts fail, the tool should always continue. It should not jam.

[rahensonzam]

Version
v1.11.1

It is still happening. It applies to all three download actions.

Looking in the network tab of devtools, all requests completed except:

GET https://www.zra.org.zm/pages/common/images/newUI/img_srchGoogleIcon.gif 404 (Not Found)
GET https://www.zra.org.zm/pages/common/images/newUI/footerline.gif 404 (Not Found)
GET https://www.zra.org.zm/pages/common/styles/menuarrow.gif 404 (Not Found)

There were no errors in the console except Invalid asm.js: Undefined global variable which is there before start.