[feature] Add location information when throwing XPathException

Author: chris-evolvedbinary

exist-core/src/main/java/org/exist/xquery/PathExpr.java

@@ -499,15 +499,15 @@ public String getLiteralValue() {
 
     @Override
     public int getLine() {
-        if (line < 0 && steps.size() > 0) {
+        if (line <= 0 && steps.size() > 0) {
             return steps.get(0).getLine();
         }
         return line;
     }
 
     @Override
     public int getColumn() {
-        if (column < 0 && steps.size() > 0) {
+        if (column <= 0 && steps.size() > 0) {
             return steps.get(0).getColumn();
         }
         return column;