NullReferenceException in ConvertFrom-Markdown -AsVT100EncodedString with empty alt text #7453
Description
Steps to reproduce
ConvertFrom-Markdown '' -AsVT100EncodedStringThis is a valid markdown (well any text is valid markdown really, but this one as well)
It produces the following:
Expected behavior
No error
Actual behavior
ConvertFrom-Markdown : A positional parameter cannot be found that accepts argument ''.
At line:1 char:1
+ ConvertFrom-Markdown ' [ConvertFrom-Markdown], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.ConvertFromMarkdownCommand
Stack Trace:
at Microsoft.PowerShell.MarkdownRender.LinkInlineRenderer.Write(VT100Renderer renderer, LinkInline obj) in /PowerShell/src/Microsoft.PowerShell.MarkdownRender/LinkInlineRenderer.cs:line 22
at Markdig.Renderers.RendererBase.Write[T](T obj)
at Markdig.Renderers.RendererBase.WriteChildren(ContainerInline containerInline)
at Microsoft.PowerShell.MarkdownRender.ParagraphBlockRenderer.Write(VT100Renderer renderer, ParagraphBlock obj) in /PowerShell/src/Microsoft.PowerShell.MarkdownRender/ParagraphBlockRenderer.cs:line 20
at Markdig.Renderers.RendererBase.Write[T](T obj)
at Markdig.Renderers.RendererBase.WriteChildren(ContainerBlock containerBlock)
at Markdig.Renderers.RendererBase.Write[T](T obj)
at Markdig.Renderers.TextRendererBase.Render(MarkdownObject markdownObject)
at Microsoft.PowerShell.MarkdownRender.MarkdownConverter.Convert(String markdownString, MarkdownConversionType conversionType, MarkdownOptionInfo optionInfo) in /PowerShell/src/Microsoft.PowerShell.MarkdownRender/MarkdownConverter.cs:line 81
at Microsoft.PowerShell.Commands.ConvertFromMarkdownCommand.ConvertEachFile(IEnumerable`1 paths, MarkdownConversionType conversionType, Boolean isLiteral, MarkdownOptionInfo optionInfo)
at Microsoft.PowerShell.Commands.ConvertFromMarkdownCommand.ProcessRecord()
at System.Management.Automation.Cmdlet.DoProcessRecord()
at System.Management.Automation.CommandProcessor.ProcessRecord()
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 6.1.0-preview.4
PSEdition Core
GitCommitId 6.1.0-preview.4
OS Darwin 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018...
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0