fix: debugger breakpoints not registered

Author: TopchetoEU

src/me/topchetoeu/jscript/engine/debug/SimpleDebugger.java

@@ -474,8 +474,9 @@ private RunResult run(Frame codeFrame, String code) {
     @Override public void setBreakpointByUrl(V8Message msg) {
         var line = (int)msg.params.number("lineNumber") + 1;
         var col = (int)msg.params.number("columnNumber", 0) + 1;
-        var cond = msg.params.string("condition", null);
+        var cond = msg.params.string("condition", "").trim();
 
+        if (cond.equals("")) cond = null;
         if (cond != null) cond  = "(" + cond + ")";
 
         Pattern regex;