ScriptREPL: recover gracefully from failed copy

When copying variables between languages, if something goes wrong,
let's just catch it, dump the error, and try to continue.

Otherwise, the language switch operation will completely fail.

Author: ctrueden

src/main/java/org/scijava/script/ScriptREPL.java

@@ -252,7 +252,12 @@ public void lang(final String langName) {
 			new DefaultScriptInterpreter(language);
 
 		// preserve state of the previous interpreter
-		copyBindings(interpreter, newInterpreter);
+		try {
+			copyBindings(interpreter, newInterpreter);
+		}
+		catch (final Throwable t) {
+			t.printStackTrace(out);
+		}
 		out.println("language -> " +
 			newInterpreter.getLanguage().getLanguageName());
 		interpreter = newInterpreter;