Show path for missing BUILD file also in external repositories

Since c578764adcf we report additional path information if a
package does not exist because of a missing BUILD file. Ensure
we also report this, if the packge is supposed to be in an
external repository.

Change-Id: Iabfd4fe0deb5e43d7cb974a46bdc328c28762db4
PiperOrigin-RevId: 247003674
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/ConstraintValueLookupUtilTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/ConstraintValueLookupUtilTest.java
index fe9f0ff..aaf1968 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/ConstraintValueLookupUtilTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/ConstraintValueLookupUtilTest.java
@@ -125,7 +125,7 @@
         .hasErrorEntryForKeyThat(key)
         .hasExceptionThat()
         .hasMessageThat()
-        .contains("no such package 'fake': BUILD file not found on package path");
+        .contains("no such package 'fake': BUILD file not found");
   }
 
   // Calls ConstraintValueLookupUtil.getConstraintValueInfo.