Fail if --restore-path has no path

[dgasaway]

• [x] I have searched open and closed issues for duplicates.
• [x] I have searched the forum for related topics.

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Environment info

• Duplicati version: 2.0.6.3
• Operating system: Windows 7
• Backend: local

Description

Feature request: Fail if the user provides --restore-path on the command line but there is no path provided. When I was testing a restore, I was getting result of "Restore completed without errors but no files were restore". After poking around for a little while, I discovered out it was attempting to restore to the original path. Finally I realized that I was missing the necessary =, so what I intended as the target path was just another path to restore. It would be helpful to users to abort if the path to --restore-path is missing rather than proceed with restoring to the original path.

Steps to reproduce

1. Duplicati.CommandLine.exe restore D:\Backup\repo kenji.jpg --restore-path D:\Backup\restore\

• Actual result: Restore completed without errors but no files were restored
• Expected result: Program abort with failure return code