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to solve EISDIR error when trying to submit a form with no file selected.
When we tried to submit a form with no file selected, then part.filename is '' but not undefined. And I think fomidable should handle this situation.
We can also modify like below:
IncomingForm.prototype.onPart = function(part) {
// this method can be overwritten by the user
if (part.filename !== '') {
this.handlePart(part);
}
};
If we don't do this, then the code will go to "file.open()" (lib/incoming_form.js:215) and then it will throw EISDIR error and then our process will stop.