Ignore empty strings in URL column on import

[jrdh]

If the url is an empty string then the MediaFeedsInternetProvider will throw a MediaInternetNoHandlerException because it can't find a handler for it. Presumably, this is desired under normal circumstances, but during an import the cell's values are empty strings so this error is thrown all the time. Therefore, preempt it before it happens!

I fixed it like this rather than patching the MediaFeedsInternetProvider itself under the assumption that other code is expecting it to throw MediaInternetNoHandlerException exceptions when it encounters
invalid strings, like the empty string. Does feel a bit hacky though.

#6062

[jrdh]

When this is released there are a few steps that are required to fully resolve #6062. These are:

1. Remove the field_file field config from the location content type - it's a biblio field and shouldn't be duplicated here delete from field_config_instance where id = 166;
2. Add new field called "File attachments", with type File, and widget Media multiselect to the location content type
3. Add formats: jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp
4. Set number allowed to unlimited

[PaulKiddle]

Can these things be done in the codebase, with drupal update hooks?

[jrdh]

I don't think so no, they're specific to one scratchpad rather than something we'd want to run against all of them.