Revert "Merge release in master (#2749)" (#2750)

This reverts commit 3e8ddcf.

Author: yyosifov

lib/node-package-manager.ts

@@ -77,7 +77,7 @@ export class NodePackageManager implements INodePackageManager {
 				throw err;
 			}
 		}
-	}
+		}
 
 	@exported("npm")
 	public async uninstall(packageName: string, config?: any, path?: string): Promise<string> {

lib/services/doctor-service.ts

@@ -226,18 +226,17 @@ class DoctorService implements IDoctorService {
 		let hasInvalidPackages = false;
 		if (this.$hostInfo.isDarwin) {
 			try {
-				await this.$childProcess.exec(`python -c "import six"`);
-			} catch (error) {
-				// error.code = 1 so the Python is present, but we don't have six.
-				if (error.code === 1) {
+				let queryForSixPackage = await this.$childProcess.exec(`pip freeze | grep '^six=' | wc -l`);
+				let sixPackagesFoundCount = parseInt(queryForSixPackage);
+				if (sixPackagesFoundCount === 0) {
 					hasInvalidPackages = true;
 					this.$logger.warn("The Python 'six' package not found.");
 					this.$logger.out("This package is required by the Debugger library (LLDB) for iOS. You can install it by running 'pip install six' from the terminal.");
-				} else {
-					this.$logger.warn("Couldn't retrieve installed python packages.");
-					this.$logger.out("We cannot verify your python installation is setup correctly. Please, make sure you have both 'python' and 'pip' installed.");
-					this.$logger.trace(`Error while validating Python packages. Error is: ${error.message}`);
 				}
+			} catch (error) {
+				this.$logger.warn("Couldn't retrieve installed python packages.");
+				this.$logger.out("We cannot verify your python installation is setup correctly. Please, make sure you have both 'python' and 'pip' installed.");
+				this.$logger.trace(`Error while validating Python packages. Error is: ${error.message}`);
 			}
 		}
 		return hasInvalidPackages;