If globbing throws an IOException, fail to construct the package instead of constructing the package with an error.

Prior to this change, if a Package.Builder object was constructed, it was guaranteed that a Package (possibly with errors) would be created. This is no longer true: if an IOException is set on the Package.Builder object, it will throw a NoSuchPackageException during #build().

PiperOrigin-RevId: 161832111

src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
index 3f72ce2..afa6a89 100644
--- a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
+++ b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
@@ -338,15 +338,15 @@
     tester.addFile("e/data.txt");
     throwOnReaddir = parentDir;
     tester.sync();
-    Target target = tester.getTarget("//e:e");
-    assertThat(((Rule) target).containsErrors()).isTrue();
-    GlobList<?> globList = (GlobList<?>) ((Rule) target).getAttributeContainer().getAttr("data");
-    assertThat(globList).isEmpty();
+    try {
+      tester.getTarget("//e:e");
+    } catch (NoSuchPackageException expected) {
+    }
     throwOnReaddir = null;
     tester.sync();
-    target = tester.getTarget("//e:e");
+    Target target = tester.getTarget("//e:e");
     assertThat(((Rule) target).containsErrors()).isFalse();
-    globList = (GlobList<?>) ((Rule) target).getAttributeContainer().getAttr("data");
+    GlobList<?> globList = (GlobList<?>) ((Rule) target).getAttributeContainer().getAttr("data");
     assertThat(globList).containsExactly(Label.parseAbsolute("//e:data.txt"));
   }