SqlCreateStatementFormatter fails on SQL graph edge tables with no additional columns

[noelbundick-msft]

I'm following along the SQL Graph sample and ran into a bug with the ms-mssql.mssql VS Code extension, which originates from the tools service here

In the doc, it creates an EDGE table like the following - note the lack of additional defined columns:

CREATE TABLE friendOf AS EDGE;

If you place the above valid statement in a file by itself and hit Format Document, I get the following stack trace. When in a file with other statements, the entire document fails to format

[Error - 11:19:01 PM] Request textDocument/formatting failed.
  Message: System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.SqlTools.ServiceLayer.Formatter.SqlCreateTableStatementFormatter.ProcessInterChildRegion(SqlCodeObject previousChild, SqlCodeObject nextChild) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\SqlCreateTableStatementFormatter.cs:line 129
   at Microsoft.SqlTools.ServiceLayer.Formatter.ASTNodeFormatterT`1.Format() in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\ASTNodeFormatterT.cs:line 152
   at Microsoft.SqlTools.ServiceLayer.Formatter.ASTNodeFormatterT`1.Format() in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\ASTNodeFormatterT.cs:line 158
   at Microsoft.SqlTools.ServiceLayer.Formatter.FormatterVisitor.Visit(SqlBatch codeObject) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\FormatterVisitor_SqlCodeObjectVisitor.cs:line 31
   at Microsoft.SqlServer.Management.SqlParser.SqlCodeDom.SqlBatch.Accept(ISqlCodeObjectVisitor visitor)
   at Microsoft.SqlTools.ServiceLayer.Formatter.ASTNodeFormatterT`1.Format() in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\ASTNodeFormatterT.cs:line 158
   at Microsoft.SqlTools.ServiceLayer.Formatter.FormatterVisitor.Visit(SqlScript codeObject) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\Impl\FormatterVisitor_SqlCodeObjectVisitor.cs:line 222
   at Microsoft.SqlServer.Management.SqlParser.SqlCodeDom.SqlScript.Accept(ISqlCodeObjectVisitor visitor)
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.DoFormat(String input, FormatOptions options, Boolean verifyOutput, Action`1 postFormatAction) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 291
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.Format(String input, FormatOptions options, Boolean verifyOutput) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 264
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.DoFormat(DocumentFormattingParams docFormatParams, TextEdit edit, String text) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 172
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.<>c__DisplayClass13_0.<FormatAndReturnEdits>b__0() in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 162
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.FormatAndReturnEdits(DocumentFormattingParams docFormatParams) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 147
   at Microsoft.SqlTools.ServiceLayer.Formatter.TSqlFormatterService.HandleRequest[T](Func`1 handler, RequestContext`1 requestContext, String requestType) in D:\a\1\s\src\Microsoft.SqlTools.ServiceLayer\Formatter\TSqlFormatterService.cs:line 246
  Code: 0 

The following statement, which defines an edge that does include additional columns, works correctly & allows the document to be formatted as expected:

CREATE TABLE likes (rating INTEGER) AS EDGE;