Do not convert sdk_version: "none"

These also require system_modules to be set. Wait until we convert
system_modules to convert sdk_version: "none"

Test: CI
Change-Id: I5bbdcb6819709a7c5a7932cb860a0de945f3528e
diff --git a/java/java.go b/java/java.go
index 0594a8b..1b9941c 100644
--- a/java/java.go
+++ b/java/java.go
@@ -2970,6 +2970,10 @@
 		// TODO(b/297356582): handle core_platform in bp2build
 		ctx.MarkBp2buildUnconvertible(bp2build_metrics_proto.UnconvertedReasonType_PROPERTY_UNSUPPORTED, "sdk_version core_platform")
 		return &javaCommonAttributes{}, &bp2BuildJavaInfo{}, false
+	} else if proptools.String(m.deviceProperties.Sdk_version) == "none" {
+		// TODO(b/297356703): handle system_modules
+		ctx.MarkBp2buildUnconvertible(bp2build_metrics_proto.UnconvertedReasonType_PROPERTY_UNSUPPORTED, "sdk_version none")
+		return &javaCommonAttributes{}, &bp2BuildJavaInfo{}, false
 	}
 
 	archVariantProps := m.GetArchVariantProperties(ctx, &CommonProperties{})