Strange warning with call stack while resolving partially from local package feed

Description

Some packages coming from a local feed have a dependency to some other feed. An warning message is shown while resolving (and maybe repeated multiple times):

Source 'Externals/NugetStore' exception: System.Exception: The package Nunit 3.7.1 can't be found in C:\Projects\pakettest\170629_2\Externals\NugetStore.
Please check the feed definition in your paket.dependencies file.
   at Paket.NuGetLocal.findLocalPackage@65-5.Invoke(String message)
   at Paket.NuGetLocal.getDetailsFromLocalNuGetPackage@84.Invoke(Unit unitVar)
   at Microsoft.FSharp.Control.AsyncBuilderImpl.callA@841.Invoke(AsyncParams`1 args)

Repro steps

Use the Repro.zip

1. .paket\paket.bootstrapper.exe

2. .paket\paket.exe install

Expected behavior

As the dependency can be resolved there is no need to show this message in normal mode. Maybe just show it in verbose mode. It's questionable whether the call stack should be printed at all.

Actual behavior

The warning message is shown always, and maybe multiple times.

Known workarounds

None.

Use the provided Repro.zip and run .paket\paket.bootstrapper.exe followed by .paket\paket.exe install. Start with the Paket.NuGetLocal.findLocalPackage@65-5 and getDetailsFromLocalNuGetPackage@84 stack-trace entries, then compare normal and verbose resolution for the local feed and the paket.dependencies definition. Done means the dependency resolves without the repeated warning and call stack in normal mode.