Cannot extract text from cells of tables with background colour

[BQSBQS]

For table with some cells with background colour, my code is unable to extract all the content. It prints '\n' for cell with background colour, and below is the output for cell._tc.xml

<w:tc xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas" xmlns:mo="http://schemas.microsoft.com/office/mac/office/2008/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="urn:schemas-microsoft-com:mac:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing" xmlns:w10="urn:schemas-microsoft-com:office:word" xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml" xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup" xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk" xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml" xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape">
  <w:tcPr>
    <w:tcW w:type="dxa" w:w="7606"/>
    <w:gridSpan w:val="5"/>
    <w:tcBorders>
      <w:bottom w:sz="8.0" w:val="single" w:color="#000000"/>
    </w:tcBorders>
    <w:shd w:fill="eceaec"/>
    <w:tcMar>
      <w:start w:w="0" w:type="dxa"/>
      <w:end w:w="0" w:type="dxa"/>
    </w:tcMar>
    <w:tcMar>
      <w:start w:w="0" w:type="dxa"/>
      <w:end w:w="0" w:type="dxa"/>
    </w:tcMar>
    <w:tcMar>
      <w:start w:w="0" w:type="dxa"/>
      <w:end w:w="0" w:type="dxa"/>
    </w:tcMar>
    <w:tcMar>
      <w:start w:w="0" w:type="dxa"/>
      <w:end w:w="0" w:type="dxa"/>
    </w:tcMar>
    <w:tcMar>
      <w:start w:w="0" w:type="dxa"/>
      <w:end w:w="0" w:type="dxa"/>
    </w:tcMar>
  </w:tcPr>
  <w:tbl>
    <w:tblPr>
      <w:tblW w:type="auto" w:w="0"/>
      <w:tblLayout w:type="fixed"/>
      <w:tblLook w:firstColumn="1" w:firstRow="1" w:lastColumn="0" w:lastRow="0" w:noHBand="0" w:noVBand="1" w:val="04A0"/>
      <w:tblInd w:w="3184.0" w:type="dxa"/>
    </w:tblPr>
    <w:tblGrid>
      <w:gridCol w:w="7606"/>
    </w:tblGrid>
    <w:tr>
      <w:trPr>
        <w:trHeight w:hRule="exact" w:val="434"/>
      </w:trPr>
      <w:tc>
        <w:tcPr>
          <w:tcW w:type="dxa" w:w="4422"/>
          <w:tcBorders/>
          <w:shd w:fill="dfe4ed"/>
          <w:tcMar>
            <w:start w:w="0" w:type="dxa"/>
            <w:end w:w="0" w:type="dxa"/>
          </w:tcMar>
        </w:tcPr>
        <w:p>
          <w:pPr>
            <w:autoSpaceDN w:val="0"/>
            <w:autoSpaceDE w:val="0"/>
            <w:widowControl/>
            <w:spacing w:line="180" w:lineRule="exact" w:before="80" w:after="0"/>
            <w:ind w:left="1956" w:right="1956" w:firstLine="0"/>
            <w:jc w:val="right"/>
          </w:pPr>
          <w:r>
            <w:rPr>
              <w:rFonts w:ascii="Gotham" w:hAnsi="Gotham" w:eastAsia="Gotham"/>
              <w:b/>
              <w:i w:val="0"/>
              <w:color w:val="000000"/>
              <w:sz w:val="16"/>
            </w:rPr>
            <w:t xml:space="preserve">2018 </w:t>
          </w:r>
          <w:r>
            <w:br/>
          </w:r>
          <w:r>
            <w:rPr>
              <w:rFonts w:ascii="Gotham" w:hAnsi="Gotham" w:eastAsia="Gotham"/>
              <w:b/>
              <w:i w:val="0"/>
              <w:color w:val="000000"/>
              <w:sz w:val="16"/>
            </w:rPr>
            <w:t>£’000</w:t>
          </w:r>
        </w:p>
      </w:tc>
    </w:tr>
  </w:tbl>
  <w:p/>
  <w:p>
    <w:pPr>
      <w:autoSpaceDN w:val="0"/>
      <w:autoSpaceDE w:val="0"/>
      <w:widowControl/>
      <w:spacing w:line="14" w:lineRule="exact" w:before="0" w:after="0"/>
      <w:ind w:left="0" w:right="0"/>
    </w:pPr>
  </w:p>
</w:tc>

[scanny]

The contents of this cell are a table and two blank paragraphs, so that output sounds about right. If you want the content inside the table nested inside the cell, you'll have to recurse down into it.