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scivision a1dc38a567 Help: Document behavior of if(EXISTS,IS_DIRECTORY) for empty paths

Document and add explicit tests for empty string input:
`if(EXISTS "")` and `if(IS_DIRECTORY "")` are always false.
This avoids need for users to do extra checks due to
CMake non-short-circuit logic as below:

    if("${p}")
      if(EXISTS "${p}")

2023-01-24 14:13:52 -05:00

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CMake

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	`if(EXISTS "")`
	`message(FATAL_ERROR "EXISTS \"\" should not exist")`
	`endif()`