Don't flatten schemas for type idents we don't know about

I hit this problem with cases where there are multiple packages with the same group and version. The schema patcher would hit a nil pointer trying to flatten a schema for a kind that exists in one package, but not another, because it seems to assume that everything's in one package. By skipping cases where the parser hasn't already found the given kind in the given package, we got past that panic and everything seems to work correctly.

Signed-off-by: Andrew Bayer <andrew.bayer@gmail.com>

pkg/schemapatcher/gen.go

@@ -128,6 +128,9 @@ func (g Generator) Generate(ctx *genall.GenerationContext) (result error) {
 			}
 
 			typeIdent := crdgen.TypeIdent{Package: pkg, Name: groupKind.Kind}
+			if _, ok := parser.Types[typeIdent]; !ok {
+				continue
+			}
 			parser.NeedFlattenedSchemaFor(typeIdent)
 
 			fullSchema := parser.FlattenedSchemata[typeIdent]