Issue when script codes are ahead of ICU

[srl295]

Caused by: com.ibm.icu.impl.IllegalIcuArgumentException: Invalid name: Ougr
    at com.ibm.icu.lang.UCharacter.getPropertyValueEnum (UCharacter.java:5176)
    at org.unicode.jsp.ScriptTester$ScriptExtensions$MyHandler.handleLine (ScriptTester.java:282)
    at org.unicode.jsp.FileUtilities$SemiFileReader.process (FileUtilities.java:97)
    at org.unicode.jsp.FileUtilities$SemiFileReader.process (FileUtilities.java:45)
    at org.unicode.jsp.ScriptTester$ScriptExtensions.make (ScriptTester.java:300)
    at org.unicode.jsp.ScriptTester.<clinit> (ScriptTester.java:325)
    at org.unicode.jsp.XPropertyFactory.<init> (XPropertyFactory.java:147)
    at org.unicode.jsp.XPropertyFactory.make (XPropertyFactory.java:39)
    at org.unicode.jsp.UnicodeUtilities.<clinit> (UnicodeUtilities.java:247)
    at org.unicode.jsp.UnicodeJsp.showPropsTable (UnicodeJsp.java:168)
    at org.apache.jsp.properties_jsp._jspService (properties_jsp.java:208)

seen in #93 while working on #88

[markusicu]

With the recent CLDR update for script metadata, there are now two scripts for Unicode 15 that are not yet in ICU. Once the Unicode Tools use the new CLDR snapshot from today, this issue should resurface.