make EspressoExternalResolvedJavaMethod#getExceptionHandlers more closely mimic the implementation in HotSpotResolvedJavaMethodImpl

Author: d-kozak

espresso-compiler-stub/src/com.oracle.truffle.espresso.vmaccess/src/com/oracle/truffle/espresso/vmaccess/EspressoExternalResolvedJavaMethod.java

@@ -144,10 +144,15 @@ public ExceptionHandler[] getExceptionHandlers() {
             int handlerBCI = handler.getMember("handlerBCI").asInt();
             int catchTypeCPI = handler.getMember("catchTypeCPI").asInt();
             Value catchTypeName = handler.getMember("catchType");
-            JavaType catchType = !catchTypeName.isNull() ? getAccess().lookupType(catchTypeName.asString(), getDeclaringClass(), false) : null;
-            if (getAccess().java_lang_Throwable.equals(catchType)) {
-                // For consistency with HotSpotResolvedJavaMethodImpl#getExceptionHandlers
+            JavaType catchType;
+            if (catchTypeCPI == 0 || catchTypeName.isNull()) {
                 catchType = null;
+            } else {
+                catchType = getAccess().lookupType(catchTypeName.asString(), getDeclaringClass(), false);
+                if (getAccess().java_lang_Throwable.equals(catchType)) {
+                    // For consistency with HotSpotResolvedJavaMethodImpl#getExceptionHandlers
+                    catchType = null;
+                }
             }
             result[i] = new ExceptionHandler(startBCI, endBCI, handlerBCI, catchTypeCPI, catchType);
         }