Add support for undefined parameters to the Filter compiler

Author: AJCStriker

package.json

@@ -1,6 +1,6 @@
 {
   "name": "strontium",
-  "version": "2.7.8",
+  "version": "2.7.9",
   "description": "Strontium is a TypeScript toolkit for High Performance API servers built for Production not Projects.",
   "main": "lib/src/index.js",
   "types": "lib/src/index.d.ts",

src/query/drivers/sql/SQLFilterCompiler.ts

@@ -39,7 +39,9 @@ export const compileSQLFilter: FilterCompiler<[string, Array<any>]> = (
 
         let subquery = filter[field]
 
-        if (subquery === null) {
+        if (subquery === undefined) {
+            continue
+        } else if (subquery === null) {
             queries.push(["?? IS NULL", [field]])
         } else if (subquery.$in !== undefined) {
             if (subquery.$in.length === 0) {