TYPO3 Core

When trying to install an extension which imports some static data, the "Make update" does not work, because there are 2 form tags interleaved.
Extension: mm_forum, static_info_tables.
HTML-Code:
... database needs to be updated with new tables or fields. ...:<form action="/typo3/mod/tools/em/index.php?CMD[showExt]=static_info_tables&CMD[load]=1" method="post"><br /><h3>Import static data</h3><form action="index.php" method="post" name="lookupform">.....
</form>...<input type="submit" name="write" value="Make updates" /></form>
Found the problem in typo3/mod/tools/em/class.em_index.php line 4629 + 4631.
Commented the both form tags and everything is running well, but don't debug, if there could be problems with other operations

(issue imported from #M7871)