make examples always start newline if there is other content before the example (#294)

Author: antonwiens

src/main/java/io/github/swagger2markup/internal/component/PropertiesTableComponent.java

@@ -186,7 +186,7 @@ public MarkupDocBuilder apply(MarkupDocBuilder markupDocBuilder, Parameters para
                 }
 
                 if (optionalExample.isPresent()) {
-                    if (isNotBlank(description) || optionalDefaultValue.isPresent()) {
+                    if (isNotBlank(descriptionContent.toString())) {
                         descriptionContent.newLine(true);
                     }