Calling Paket.Dependencies.GetInstalledPackageModel with wrong casing on mono.

[Krzysztof-Cieslak]

Description

Calling Paket.Dependencies.GetInstalledPackageModel with wrong casing (for example paket.core instead of Paket.Core) on mono results in empty InstallationModel. On Windows it normally resolves correct InstallationModel

Repro steps

1. Be on mono
2. Add Paket.Core to paket.dependencies file
3. Create fsx script, reference stuff, find and load dependency file
4. Run dependenciesFile.GetInstalledPackageModel(None, "paket.core")

Expected behavior

Option 1. Return InstallationModel with all dlls resolved (same behavior as on Windows)
Option 2. Change GetInstalledPackageModel to return option and return None
Option 3. Throw exception ;) ... just kidding

Actual behavior

Returns empty InstallationModel (only with name [wrong casing])

Known workarounds

Call it with well formatted name.