NPE from union type syntax error

[GregoryTravis]

A missing type literal causes an NPE:

-fan_out_to_columns : Table -> Text | Integer -> (Any -> Vector Any) -> Integer | Nothing -> Problem_Behavior -> Table | Nothing
+fan_out_to_columns : Table -> Text | Integer -> (Any -> Vector Any) -> | Nothing -> Problem_Behavior -> Table | Nothing

Steps to reproduce:

$ git checkout bug/gmt/npe-missing-return-type
$ built-distribution/enso-engine-0.0.0-dev-macos-amd64/enso-0.0.0-dev/bin/enso --run test/Table_Tests/src/In_Memory/Split_Tokenize_Spec.enso --in-project test/Table_Tests --no-ir-caches

Expected result: runs tests normally.

Actual result:

Execution finished with an error: java.lang.NullPointerException
        at <java> org.enso.compiler.TreeToIr.translateType(TreeToIr.java:1087)
        at <java> org.enso.compiler.TreeToIr.translateType(TreeToIr.java:1098)
        at <java> org.enso.compiler.TreeToIr.translateType(TreeToIr.java:1098)
        at <java> org.enso.compiler.TreeToIr.translateModuleSymbolImpl(TreeToIr.java:329)
        at <java> org.enso.compiler.TreeToIr.translateModuleSymbol(TreeToIr.java:228)
        at <java> org.enso.compiler.TreeToIr.translateModule(TreeToIr.java:206)
        at <java> org.enso.compiler.TreeToIr.translate(TreeToIr.java:93)
        at <java> org.enso.compiler.EnsoCompiler.generateIR(EnsoCompiler.java:48)
        at <java> org.enso.compiler.Compiler.uncachedParseModule(Compiler.scala:587)
        at <java> org.enso.compiler.Compiler.parseModule(Compiler.scala:552)
[...]

[enso-bot]

Jaroslav Tulach reports a new STANDUP for yesterday (2023-04-25):

Progress: - TreeToIr NPE bugfix: #6415

• Integrated GraalVM EE only improvements: Improve inlining of <| on (GraalVM EE) #6384
• speeding <| possible on CE: Improve inlining of <| on GraalVM CE #6416
• review of Table Visualization and display text changes. #6382 (review)
• reading/commenting on https://docs.google.com/document/d/1CoUbJ7lIVxtPYR_jRB6Ra8W3Nt9EQewRXSECc1ICi9w
• Any == Vector discussion: Equality on types with Any as LHS does not work #5612 (comment)
• solution for enso_project builtin: Reimplement enso_project as a proper builtin #6352 (comment)
• planning and cleaning engine issues
• debugging rust part of Enso parser: https://discord.com/channels/401396655599124480/407883689624731658/1100337378406699028 It should be finished by 2023-04-26.

Next Day: Processing backlog & meetings

Google Docs

Notes - Review Component Browser Suggestions and Plan

| Attendees: Notes Post clean up of private still long lists. Any methods show up for all types. Need to hide overrides so only listed once by tagging them as PRIVATE. We should fold methods so only shown once No need to list `to_text` for the type and for `Any`. Favorites currently o...

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