fix: fixed an issue where we tried to resolve null as path

Author: Martin Dimitrov

lib/monitor/watch.js

@@ -142,18 +142,20 @@ function filterAndRestart(files) {
 
     // if there's no matches, then test to see if the changed file is the
     // running script, if so, let's allow a restart
-    const script = path.resolve(config.options.execOptions.script);
-    if (matched.result.length === 0 && script) {
-      const length = script.length;
-      files.find(file => {
-        if (file.substr(-length, length) === script) {
-          matched = {
-            result: [ file ],
-            total: 1,
+    if (config.options.execOptions.script) {
+      const script = path.resolve(config.options.execOptions.script);
+      if (matched.result.length === 0 && script) {
+        const length = script.length;
+        files.find(file => {
+          if (file.substr(-length, length) === script) {
+            matched = {
+              result: [ file ],
+              total: 1,
+            }
+            return true;
           }
-          return true;
-        }
-      })
+        })
+      }
     }
 
     utils.log.detail('changes after filters (before/after): ' +