docs: @Nonnull
      public static List<String> removeEmptyEntries(@Nullable List<String> input) {
          if(input==null) {
              return Collections.emptyList();
          }
          Iterable<String> trimmedInputs = Iterables.transform(input, TRIM);
          Iterable<String> nonEmptyInputs = Iterables.filter(trimmedInputs, NOT_EMPTY);
          return Lists.newArrayList(nonEmptyInputs);
      }