Opening a PDF without metadata (eg a scanned document) will crash. [How to Removing Metadata](https://github.com/uxmstudio/UXMPDFKit/files/2118248/Removing.Metadata.pdf) ## Steps to Reproduce (for bugs) 1. open pdf(without metadata) ## Your Environment * iOS Version: 11.4 * Xcode Version: 9.4 * Swift Version: 3.3
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