null check bug fix

Author: andrey18106

README.md

@@ -38,12 +38,12 @@ To start working on frontend follow this steps:
 
 1. ☁ Clone this into your `apps` folder of your Nextcloud.
 1. 👩‍💻 In a terminal, run the command `make dev-setup` to install the dependencies.
-1. 🏗 Then to build the frontend application run `make build-js` (builds Vue application in production mode), or watch changes with: `make watch-js` (in development mode).
+1. 🏗 Then to build the frontend application run `make build-js-production` (builds Vue application in production mode), or watch changes with: `make watch-js` (in development mode).
 1. ✅ Enable the app through the app management of your Nextcloud.
 1. 💻 Fix easily linting issues with `npm run lint:fix`.
 
 ## Support us
 
 You can support us with any donate amount.
 
-[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/donate?hosted_button_id=H5PLJJMWLDNJQ)
+[![PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/donate?hosted_button_id=H5PLJJMWLDNJQ)

lib/Migration/AppUpdateStep.php

@@ -66,12 +66,12 @@ public function run(IOutput $output) {
 			$installedSetting = $this->settingsService->getSettingByName('installed')['setting'];
 			$installed = json_decode($installedSetting->getValue(), true);
 			if (isset($installed['not_installed_list'])) {
-				if (count($installed['not_installed_list']['boost']) > 0) {
+				if (isset($installed['not_installed_list']['boost']) && count($installed['not_installed_list']['boost']) > 0) {
 					$installResult = $this->pythonService->installDependencies();
 				} else {
 					$installResult = $this->pythonService->installDependencies('required optional boost');
 				}
-				if ($installResult['installed']) {
+				if (isset($installResult['installed']) && $installResult['installed']) {
 					$installed['not_installed_list'] = [
 						'required' => $installResult['required'],
 						'optional' => $installResult['optional'],