_handle error at non-opencl platform when data is loaded

[wojciech]

When data is loaded first time model computation raise _handle error:
AttributeError: 'NoneType' object has no attribute '_handle'.

It is most like triggered by kernell.dll release() fucntion (line 336). I activated this function to make plugin models recompiled. It doesn't seem to cause any trouble apart from anoying message but needs to be fixed. This may be tcc issue only.

[wojciech]

In 880e84561dc182c3b191ad7eba368a7725abcc72/sasview:

Adding short time delay upon model loading to prevent double compilation. It is releated to _handle error reported in #778

[wojciech]

In def512c24c49b6fd47e37a8368e15a18642f2949/sasview:

Fixing double compilation for all Windows (regardless if OpenCL installed tor not). Related to #778

[pkienzle]

See also ticket #667. If you can avoid evaluating the model twice then it won't try to compile twice and there will be no conflict and no need for an artificial sleep.

[GitHub <noreply@…>]

In 06a4306baf90c3345a5d88692dd195f436f59ab6/sasview:

Merge pull request #16 from SasView?/ticket778

Ticket778