Still not fixed in 7.0.2 nor in 7.1.0.CR1b. Probably reported as AS7-1970.
I see myself forced to this workaround:
URL jar = MyClass.class.getProtectionDomain().getCodeSource().getLocation();
VirtualFile jarFile = VFS.getChild(jar.toURI());
Manifest manifest = VFSUtils.getManifest(jarFile);
Attributes attributes = manifest.getMainAttributes();
String implementationTitle = attributes.getValue(Name.IMPLEMENTATION_TITLE);