String text = "";
        String field = "content";

        List<String> results = converter.convert(text, field, "en");

        assertNotNull(results);
        assertTrue(results.isEmpty() || (results.size() == 1 && results.get(0).isEmpty()));
    }

    @Test
    public void testConvertWithNullText() throws IOException {
        // Test convert with null text - this might throw exception
        String text = null;

                responseData.setCharSet(charset);
                responseData.setContentLength(0);
            } else if (file.isFile()) {
                // check file size
                responseData.setContentLength(file.length());
                checkMaxContentLength(responseData);

                parseFileOwnerAttribute(responseData, file);

                    }
                    if (logger.isDebugEnabled()) {
                        logger.debug(line);
                    }
                    list.add(line);
                    if (list.size() > maxLineBuffer) {
                        list.remove(0);
                    }
                } catch (final IOException e) {
                    throw new CrawlerSystemException(e);
                }

<setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="false"/>
<setting id="org.eclipse.jdt.core.formatter.indentation.size" value="4"/>
<setting id="org.eclipse.jdt.core.formatter.insert_space_after_postfix_operator" value="do not insert"/>
<setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_for_increments" value="insert"/>

<setting id="org.eclipse.wst.jsdt.core.formatter.insert_space_before_closing_paren_in_synchronized" value="do not insert"/>
<setting id="org.eclipse.wst.jsdt.core.formatter.tabulation.size" value="2"/>
<setting id="org.eclipse.wst.jsdt.core.formatter.format_guardian_clause_on_one_line" value="true"/>

                    roles, null, SuggestItem.Kind.QUERY));
        }

        return items.toArray(new SuggestItem[items.size()]);
    }

    private SuggestItem[] getItemSet2() {
        List<SuggestItem> items = new ArrayList<>();

        {
            String[][] readings = new String[2][];

            httpEntity = response.getEntity();

            final int httpStatusCode = response.getStatusLine().getStatusCode();
            if (httpStatusCode == 200) {

                // check file size
                final Header contentLengthHeader = response.getFirstHeader("Content-Length");
                if (contentLengthHeader != null) {
                    final String value = contentLengthHeader.getValue();

        "language":   "dutch"
      },
      "dutch_override": {
        "type":       "stemmer_override",
        "rules": [
          "fiets=>fiets",
          "bromfiets=>bromfiets",
          "ei=>eier",
          "kind=>kinder"
        ]
      },
      "english_keywords": {
        "type":       "keyword_marker",
        "keywords":   ["hello"]
      },
      "finnish_stop": {