2.7.5 release

[ghost]

What is the purpose of the change

org.apache.dubbo.common.extension.ExtensionLoader#cacheDefaultExtensionName
Remove unnecessary logical judgments,i think there is a default extension name on extension ,it should't split with pattern.

Verifying this change

 private void cacheDefaultExtensionName() {
         final SPI defaultAnnotation = type.getAnnotation(SPI.class);
         if (defaultAnnotation == null) {
             return;
         }
         String value = defaultAnnotation.value();
         if ((value = value.trim()).length() > 0) {
             cachedDefaultName = value;
            /* String[] names = NAME_SEPARATOR.split(value);
             if (names.length > 1) {
                 throw new IllegalStateException("More than 1 default extension name on extension " + type.getName()
                         + ": " + Arrays.toString(names));
             }
             if (names.length == 1) {
                 cachedDefaultName = names[0];
             }*/
         }
     }

[ghost]

operate error