Fix two incorrect usages of `SkyframeLookupResult` All the values have to be checked for nullness individually. Fixes the following two NPEs: 1. https://github.com/bazel-contrib/rules_go/pull/4531#discussion_r2594543426 ``` java.lang.NullPointerException: Cannot invoke "com.google.devtools.build.lib.skyframe.PackageValue.getPackage()" because the return value of "com.google.devtools.build.skyframe.SkyframeLookupResult.getOrThrow(com.google.devtools.build.skyframe.SkyKey, java.lang.Class)" is null at com.google.devtools.build.lib.skyframe.TestExpansionFunction.getPrerequisites(TestExpansionFunction.java:169) at com.google.devtools.build.lib.skyframe.TestExpansionFunction.computeExpandedTests(TestExpansionFunction.java:85) ... ``` 2. https://github.com/bazelbuild/bazel/issues/27942 ``` java.lang.NullPointerException at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source) at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source) at com.google.devtools.build.lib.skyframe.DirectoryTreeDigestFunction.getSubDirTreeDigests(DirectoryTreeDigestFunction.java:140) at com.google.devtools.build.lib.skyframe.DirectoryTreeDigestFunction.compute(DirectoryTreeDigestFunction.java:65) ``` Speculative fix for #27942 Closes #27959. PiperOrigin-RevId: 843808256 Change-Id: I012756ec8a641c68bca31fe155d230caa00d8a3f
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