Don't create a C++ module if there are no modular headers. A module w…

…ithout any

modular headers does not provide value.

RELNOTES: None.
PiperOrigin-RevId: 351366029

src/main/java/com/google/devtools/build/lib/rules/cpp/CcCompilationHelper.java

@@ -1227,7 +1227,8 @@ private boolean getGeneratesNoPicHeaderModule() {
 
   /** @return whether we want to provide header modules for the current target. */
   private boolean shouldProvideHeaderModules() {
-    return featureConfiguration.isEnabled(CppRuleClasses.HEADER_MODULES);
+    return featureConfiguration.isEnabled(CppRuleClasses.HEADER_MODULES)
+        && (!publicHeaders.isEmpty() || !privateHeaders.isEmpty());
   }
 
   /** @return the no-PIC header module artifact for the current target. */