Negative progress on downloads

[richardgroves]

It is possible to have a download progress block called with a negative progress value.

This occurs as the line:

Parse-SDK-iOS-OSX/Parse/Parse/Internal/Commands/CommandRunner/URLSession/Session/TaskDelegate/PFURLSessionFileDownloadTaskDelegate.m

Line 62 in b6ec05c

int progress = (int)(self.downloadedBytes / (double)self.response.expectedContentLength * 100);

does not include a check for self.response.expectedContentLength == NSURLResponseUnknownLength (NSURLResponseUnknownLength = -1).

[parse-github-assistant]

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[richardgroves]

Closing as the GitHub 'start a new issue from a line of code in the browser' doesn't start with the template required here, and back porting template in seems like a PITA - see #1705 (comment) instead