fix: throw error if the param being passed to ctx.contract.create function is not detected to be a contract

Author: boblat

src/subcontexts/contract-context.ts

@@ -167,8 +167,8 @@ export class ContractContext {
       return false
     } else if (proto === Contract) {
       return true
-    } else if (proto === null) {
-      return false
+    } else if (proto === Object || proto === null) {
+      throw new Error('Cannot create a contract for class as it does not extend Contract or BaseContract')
     }
     return this.isArc4(proto)
   }