renamed "emptystmt" to "empty_stmt"

javascript/ql/src/semmle/javascript/Stmt.qll

@@ -128,7 +128,7 @@ class LoopStmt extends TLoopStmt, ControlStmt {
  * ;
  * ```
  */
-class EmptyStmt extends @emptystmt, Stmt { }
+class EmptyStmt extends @empty_stmt, Stmt { }
 
 /**
  * A block of statements.

javascript/ql/src/semmlecode.javascript.dbscheme

@@ -149,7 +149,7 @@ jump_targets (unique int jump: @stmt ref,
 @stmt_container = @toplevel | @function | @namespace_declaration | @external_module_declaration | @global_augmentation_declaration;
 
 case @stmt.kind of
-   0 = @emptystmt
+   0 = @empty_stmt
 |  1 = @blockstmt
 |  2 = @exprstmt
 |  3 = @ifstmt

javascript/ql/src/semmlecode.javascript.dbscheme.stats

@@ -54,7 +54,7 @@
 <v>1096691</v>
 </e>
 <e>
-<k>@emptystmt</k>
+<k>@empty_stmt</k>
 <v>1136</v>
 </e>
 <e>