Revert "fix: try to remove unnecessary paragraph", which caused #418

This reverts commit cb74868247.

src/file/document/body/body.spec.ts

@@ -22,6 +22,9 @@ describe("Body", () => {
 
             expect(tree).to.deep.equal({
                 "w:body": [
+                    {
+                        "w:p": {},
+                    },
                     {
                         "w:sectPr": [
                             { "w:pgSz": { _attr: { "w:w": 10000, "w:h": 10000, "w:orient": "portrait" } } },

src/file/document/body/body.ts

@@ -1,5 +1,5 @@
 import { IXmlableObject, XmlComponent } from "file/xml-components";
-import { TableOfContents } from "../..";
+import { Paragraph, ParagraphProperties, TableOfContents } from "../..";
 import { SectionProperties, SectionPropertiesOptions } from "./section-properties/section-properties";
 
 export class Body extends XmlComponent {
@@ -18,6 +18,9 @@ export class Body extends XmlComponent {
      * @param options new section options
      */
     public addSection(options: SectionPropertiesOptions): void {
+        const currentSection = this.sections.pop() as SectionProperties;
+        this.root.push(this.createSectionParagraph(currentSection));
+
         this.sections.push(new SectionProperties(options));
     }
 
@@ -36,4 +39,12 @@ export class Body extends XmlComponent {
     public getTablesOfContents(): TableOfContents[] {
         return this.root.filter((child) => child instanceof TableOfContents) as TableOfContents[];
     }
+
+    private createSectionParagraph(section: SectionProperties): Paragraph {
+        const paragraph = new Paragraph({});
+        const properties = new ParagraphProperties({});
+        properties.addChildElement(section);
+        paragraph.addChildElement(properties);
+        return paragraph;
+    }
 }