Empty bicepconfig.json breaks CLI

[StefanIvemo]

Bicep version
Bicep CLI version 0.4.743 (b316af9eee)
ms-azuretools.vscode-bicep@0.4.743-gb316af9eee

Describe the bug
If you have a file named bicepconfig.json with no content the CLI will throw an unhandled exception.

Unhandled exception. System.Exception: Could not load configuration file. The input does not contain any JSON tokens. Expected the input to star   at Bicep.Core.Semantics.SemanticModel.get_LinterAnalyzer()
   at Bicep.Core.Semantics.SemanticModel.GetAnalyzerDiagnostics(ConfigHelper overrideConfig)
   at Bicep.Core.Semantics.SemanticModel.AssembleDiagnostics(ConfigHelper overrideConfig)
   at Bicep.Core.Semantics.SemanticModel.<.ctor>b__8_5()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.get_Value()
   at Bicep.Core.Semantics.SemanticModel.GetAllDiagnostics(ConfigHelper overrideConfig)
   at Bicep.Core.Semantics.Compilation.<>c__DisplayClass12_0.<GetAllDiagnosticsByBicepFile>b__1(BicepFile bicepFile)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector)
   at Bicep.Core.Semantics.Compilation.GetAllDiagnosticsByBicepFile(ConfigHelper overrideConfig)
   at Bicep.Cli.Services.CompilationService.LogDiagnostics(Compilation compilation)
   at Bicep.Cli.Services.CompilationService.CompileAsync(String inputPath, Boolean skipRestore)
   at Bicep.Cli.Commands.BuildCommand.RunAsync(BuildArguments args)
   at Bicep.Cli.Program.RunAsync(String[] args)
   at Bicep.Cli.Program.<Main>(String[] args)

To Reproduce

1. Create an empty file named bicepconfig.json
2. Create an empty bicep file named foo.bicep
3. Run bicep build .\foo.bicep

Additional context
Should not throw an unhandled exception. The error message should let the user know the path to the bicepconfig.json file that can't be loaded.

The VS Code extension handles it better, but again since bicep will look up the tree until it finds a bicepconfig.json file it should let the user know which one to correct.

Could not load configuration file. The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. LineNumber: 0 | BytePositionInLine: 0.(Fatal)`