code: @Nullable
      public static String nullIfBlank(@Nullable String value) {
          if (isBlank(value)) {
              return null;
          }
          return value;
      }
docs: Swap {@code null} for blank text values.
  
  @param value an input string that may or may not be entirely whitespace
  @return {@code null} if the string is entirely whitespace, otherwise the input value