Enhanced the way BPTPI deals wwith non-BPTPI related errors that cause BPTPI to stall when uploading or saving p photo's. Now it displays an error message and advices Users how to resolve it.

git-svn-id: https://plugins.svn.wordpress.org/bulk-photo-to-product-importer-extension-for-woocommerce/trunk@878853 b8457f37-d9ea-0310-8a92-e5e31aec5664