Fix AbstractScrollGui dividing by lineLength = 0

Author: NichtStudioCode

invui/src/main/java/xyz/xenondevs/invui/gui/AbstractScrollGui.java

@@ -149,15 +149,15 @@ private int correctLine(int line) {
 
     @Override
     public int getLineCount() {
-        if (elements == null)
+        if (elements == null || lineLength == 0)
             return 0;
 
         return (int) Math.ceil((double) elements.size() / (double) lineLength);
     }
 
     @Override
     public int getMaxLine() {
-        if (elements == null)
+        if (elements == null || lineLength == 0)
             return 0;
 
         int visibleLines = contentListSlots.length / lineLength;