load() doesn't check whether file exists before offering alternative IO packages

[IanButterworth]

Here fake/fake.png doesn't exist. Instead of detecting that the file doesn't exist, FileIO returns file IO package options for the file format .png that aren't installed.

I believe load should always be used with files that exist.. so perhaps the first step in load should be checking for isfile()?

julia> using FileIO

julia> FileIO.load("fake/fake.png")
Errors encountered while loading "fake/fake.png".
All errors:
===========================================
Failed to open fake/fake.png
===========================================
ArgumentError: Package QuartzImageIO not found in current path:
- Run `import Pkg; Pkg.add("QuartzImageIO")` to install the QuartzImageIO package.

===========================================
ArgumentError: Package ImageMagick not found in current path:
- Run `import Pkg; Pkg.add("ImageMagick")` to install the ImageMagick package.

===========================================

Fatal error:
ERROR: Failed to open fake/fake.png
....