Fix #3242: getSelections bug when transform table from html

src/bootstrap-table.js

@@ -1846,7 +1846,7 @@
                     that.options.cardView ? '</div>' : '</td>'
                 ].join('');
 
-                item[that.header.stateField] = value === true || (value && value.checked);
+                item[that.header.stateField] = value === true || (!!value_ || value && value.checked);
             } else {
                 value = typeof value === 'undefined' || value === null ?
                     that.options.undefinedText : value;