Bool is error?

[GoogleCodeExporter]

Is there already a way to catch an error?

eg. Image cannot be processed for x reasons (doesnt matter why, what matters is 
it didnt work) -> returns false.

Directly placing the whole img url + params in the browser is great to 
understand the error, but when url is within img tags, and process doesnt go as 
expected, all I get is a broken img obviously... while I would like to display 
something else, if img is broken/has issues.

Thank you!

Original issue reported on code.google.com by [email protected] on 9 Feb 2014 at 1:43