KLR should not throw unhandled exception, but a more meaningful message

[JaneZhouQ]

When by accident used "K list" vs. "KVM List" after readme for MusicStore. I found this exception.

Expected: a more clear error message that tells me this is a invalid command. or at least give me a much concise version of unhanded Exceptions. 

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has
been thrown by the target of an invocation. ---> System.Reflection.TargetInvocat
ionException: Exception has been thrown by the target of an invocation. ---> Sys
tem.IO.FileLoadException: Could not load file or assembly 'list, Culture=neutral
, PublicKeyToken=null' or one of its dependencies. An operation is not legal in
the current state. (Exception from HRESULT: 0x80131509) ---> System.InvalidOpera
tionException: Resolved assembly's simple name should be the same as of the requ
ested assembly.
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyName(AssemblyNam
e assemblyName)
   at System.Runtime.Loader.AssemblyLoadContext.Resolve(IntPtr gchManagedAssembl
yLoadContext, AssemblyName assemblyName)
   --- End of inner exception stack trace ---
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String cod
eBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&
stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntro
spection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String code
Base, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& s
tackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntros
pection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName as
semblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMar
k& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIn
trospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName as
semblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMar
k& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean sup
pressSecurityChecks)
   at System.Reflection.Assembly.Load(AssemblyName assemblyRef)
   at Microsoft.Framework.Runtime.DefaultHost.GetEntryPoint(String applicationNa
me)
   at Microsoft.Framework.ApplicationHost.Program.ExecuteMain(DefaultHost host,
String applicationName, String[] args)
   at Microsoft.Framework.ApplicationHost.Program.Main(String[] args)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments,
 Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Objec
t[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke
Attr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at Microsoft.Framework.Runtime.Common.EntryPointExecutor.Execute(Assembly ass
embly, String[] args, IServiceProvider serviceProvider)
   at klr.host.Bootstrapper.Main(String[] args)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments,
 Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Objec
t[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke
Attr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at klr.hosting.RuntimeBootstrapper.Execute(String[] args)
   at DomainManager.Execute(Int32 argc, Char** argv)