Fixed broken archive function when done file didn't exist...

Fixed broken archive function when done file didn't exist (https://github.com/ransome1/sleek/issues/400)

package.json

 {
   "name": "sleek",
   "productName": "sleek",
-  "version": "1.2.3-rc.1",
+  "version": "1.2.3-rc.2",
   "description": "todo.txt manager for Linux, Windows and MacOS, free and open-source (FOSS)",
   "synopsis": "todo.txt manager for Linux, Windows and MacOS, free and open-source (FOSS)",
   "category": "ProjectManagement",

snap/snapcraft.yaml

 name: sleek
 base: core18
-version: "1.2.2"
+version: "1.2.3"
 summary: todo.txt manager for Linux, free and open-source (FOSS)
 description: |
   sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. Stripped down to only the most necessary features, and with a clean and simple interface, sleek aims to help you focus on getting things done.

src/main.js

@@ -76,16 +76,18 @@ function getChannel() {
 function getContent(file) {
   try {
 
-    if(!file) return false;
+    // only continue if file has been passed and if it exists
+    if(!file || (file && !fs.existsSync(file))) return false
 
     // only for MAS (Sandboxed)
     // https://gist.github.com/ngehlert/74d5a26990811eed59c635e49134d669
-    const activeFile = getActiveFile();
-    if(process.mas) stopAccessingSecurityScopedResource = app.startAccessingSecurityScopedResource(activeFile[3])
+    if(process.mas) {
+      const activeFile = getActiveFile();
+      stopAccessingSecurityScopedResource = app.startAccessingSecurityScopedResource(activeFile[3])
+    }
 
     return Promise.resolve(fs.readFileSync(file, {encoding: "utf-8"}, function(error, data) { 
       if(process.mas) stopAccessingSecurityScopedResource()
-
       return data;
     }));