fix mysterious "undefined jpc" issues on drag

[GoogleCodeExporter]

every now and then, while dragging, errors are reported to the console.  they 
don't break anything but they're still not wanted.

discussion here:

http://groups.google.com/group/jsplumb/t/a78afc2b0ab3fc00

and here:

http://groups.google.com/group/jsplumb/t/29bf3edb848be250

Original issue reported on code.google.com by simon.po...@gmail.com on 17 Feb 2012 at 12:18

[GoogleCodeExporter]

this is hard to replicate.  i've wrapped the code that seems to be causing it 
with a check against the 'jpc' object; if its null we dont continue.  so, 
calling this fixed, but with the creeping feeling that it may come back to me...

Original comment by simon.po...@gmail.com on 27 Feb 2012 at 4:17

• Changed state: Fixed
• Added labels: Milestone-1.3.6

[GoogleCodeExporter]

I've 2 divs on a canvas, one of the divs is made to be a 'target' using the 
jsPlumb makeTarget function call. When i move the other div on top of the 
target div this message appears in the console: "jsPlumb function failed : 
TypeError: jpc is undefined" from line 86 jquery.jsplumb-1.3.6-all.js. 
Moreover; no loss in functionality is observed.

Original comment by Brendan....@gmail.com on 16 Mar 2012 at 11:49

[GoogleCodeExporter]

This issue was marked fixed in 1.3.7.

Original comment by simon.po...@gmail.com on 16 Mar 2012 at 12:11

[GoogleCodeExporter]

This issue was marked fixed in 1.3.7.

Original comment by simon.po...@gmail.com on 16 Mar 2012 at 12:11

[GoogleCodeExporter]

This issue was marked fixed in 1.3.7.

Original comment by simon.po...@gmail.com on 16 Mar 2012 at 12:11