Do not rewrite .jdeps file when it is empty.

`JavaCompileAction` rewrites the `.jdeps` files after running the spawn if path stripping was used. The code skips the rewrite if there is [any unstripped path in the file](https://github.com/bazelbuild/bazel/blob/6142eac9153b539661c43dada5e11b552a6f58f6/src/main/java/com/google/devtools/build/lib/rules/java/JavaCompileAction.java#L699-L703). This will not happen if the jdeps file is empty.

Skip rewriting the `.jdeps` file if there are no paths in it.

PiperOrigin-RevId: 447475281

src/main/java/com/google/devtools/build/lib/rules/java/JavaCompileAction.java

@@ -692,6 +692,11 @@ static Deps.Dependencies createFullOutputDeps(
       }
     }
 
+    // No paths to rewrite.
+    if (executorJdeps.getDependencyCount() == 0) {
+      return executorJdeps;
+    }
+
     // Rewrite the .jdeps proto with full paths.
     Deps.Dependencies.Builder fullDepsBuilder = Deps.Dependencies.newBuilder(executorJdeps);
     for (Deps.Dependency.Builder dep : fullDepsBuilder.getDependencyBuilderList()) {