Incorrect log text with {this}, and NullPointerException on hover, for texts of copied abilities

[Cguy7777]

Tested on most recent commit at time of writing. (266f5ee)

To reproduce:

1. Activate or trigger an ability, with or without {this} in its text.
2. Copy that ability using e.g. Lithoform Engine.

Expected results:
The log explaining what just happened includes the text of the ability with "{this}" replaced by the proper name if necessary.
You can hover over the highlighted stack ability in the log for more information.

Actual results:
If present, the literal text "{this}" is kept in the log.
If it was a triggered ability, hovering over the highlighted text for the ability instantly results in a NPE (log below).

Example hover text copying the ETB of a Navigator's Compass:
12:06 AM, T2.M1: Human activates: copy target activated or triggered ability you control. You may choose new targets for the copy. from Lithoform Engine [749] targeting stack ability (When {this} enters, you gain 3 life.) [0c2]

---

Error type: CLIENT - unhandled error in GUI - NullPointerException

Client version: 1.4.55-V3 (build: runtime)
Java version: 11.0.25
Default charset: UTF-8

NullPointerException - look at server or client logs for more details

Stack trace:
mage.client.util.gui.GuiDisplayUtil.replaceNamesInRule(GuiDisplayUtil.java:432)
mage.client.util.gui.GuiDisplayUtil.getRulesFromCardView(GuiDisplayUtil.java:409)
org.mage.plugins.card.info.CardInfoPaneImpl.lambda$setCard$0(CardInfoPaneImpl.java:56)
java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
java.base/java.security.AccessController.doPrivileged(Native Method)
java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
and other 6 lines