Travis fails to collect coverage data, errors out

[fingolfin]

On this successful (!) Travis build, we see the following Julia exception (which however, does not lead to the job as being marked as failed, which I find worrying):

 julia etc/gather_coverage.jl
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
ERROR: LoadError: path /home/travis/.julia/packages/GAP/95DX2 for package GAP no longer exists. Remove the package or `develop` it at a new path
Stacktrace:
 [1] pkgerror(::String) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Pkg/src/Types.jl:120
 [2] collect_fixed!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Dict{Base.UUID,String}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Pkg/src/Operations.jl:121
 [3] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Nothing) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Pkg/src/Operations.jl:345
 [4] resolve_versions! at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Pkg/src/Operations.jl:315 [inlined]

[fingolfin]

This doesn't happen anymore. Not sure if it is gone for good, but I also see no point in keeping this issue open.