Fix tns doctor command

lib/android-tools-info.ts

@@ -38,16 +38,19 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 		private $logger: ILogger,
 		private $options: IOptions) {}
 
-	public getPathToAndroidExecutable(): IFuture<string> {
+	public getPathToAndroidExecutable(options?: {showWarningsAsErrors: boolean}): IFuture<string> {
 		return ((): string => {
+			if(options) {
+				this.showWarningsAsErrors = options.showWarningsAsErrors;
+			}
 			if (!this.pathToAndroidExecutable) {
 				if(this.validateAndroidHomeEnvVariable(this.androidHome).wait()) {
 					let androidPath = path.join(this.androidHome, "tools", this.androidExecutableName);
 					if(!this.trySetAndroidPath(androidPath).wait() && !this.trySetAndroidPath(this.androidExecutableName).wait()) {
 						this.printMessage(`Unable to find "${this.androidExecutableName}" executable file. Make sure you have set ANDROID_HOME environment variable correctly.`);
 					}
 				} else {
-					this.printMessage("ANDROID_HOME environment variable is not set correctly.");
+					this.$logger.trace("ANDROID_HOME environment variable is not set correctly.");
 				}
 			}
 
@@ -338,11 +341,14 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 		return (() => {
 			if (!this.installedTargetsCache) {
 				try {
-					let result = this.$childProcess.spawnFromEvent(this.getPathToAndroidExecutable().wait(), ["list", "targets"], "close", {}, {throwError: false}).wait();
-					if(result.stdout) {
-						this.$logger.trace(result.stdout);
-						this.installedTargetsCache = [];
-						result.stdout.replace(/id: \d+ or "(.+)"/g, (m:string, p1:string) => (this.installedTargetsCache.push(p1), m));
+					let pathToAndroidExecutable = this.getPathToAndroidExecutable().wait();
+					if(pathToAndroidExecutable) {
+						let result = this.$childProcess.spawnFromEvent(pathToAndroidExecutable, ["list", "targets"], "close", {}, {throwError: false}).wait();
+						if(result && result.stdout) {
+							this.$logger.trace(result.stdout);
+							this.installedTargetsCache = [];
+							result.stdout.replace(/id: \d+ or "(.+)"/g, (m:string, p1:string) => (this.installedTargetsCache.push(p1), m));
+						}
 					}
 				} catch(err) {
 					this.$logger.trace("Unable to get Android targets. Error is: " + err);

lib/declarations.ts

@@ -126,9 +126,10 @@ interface IAndroidToolsInfo {
 	/**
 	 * Returns the path to `android` executable. It should be `$ANDROID_HOME/tools/android`.
 	 * In case ANDROID_HOME is not defined, check if `android` is part of $PATH.
+	 * @param {any} options Defines if the warning messages should treated as error.
 	 * @return {string} Path to the `android` executable.
 	 */
-	getPathToAndroidExecutable(): IFuture<string>;
+	getPathToAndroidExecutable(options?: {showWarningsAsErrors: boolean}): IFuture<string>;
 
 	/**
 	 * Gets the path to `adb` executable from ANDROID_HOME. It should be `$ANDROID_HOME/platform-tools/adb` in case it exists.

lib/services/android-project-service.ts

@@ -79,7 +79,7 @@ export class AndroidProjectService extends projectServiceBaseLib.PlatformProject
 			this.validateProjectName(this.$projectData.projectName);
 
 			// this call will fail in case `android` is not set correctly.
-			this.$androidToolsInfo.getPathToAndroidExecutable().wait();
+			this.$androidToolsInfo.getPathToAndroidExecutable({showWarningsAsErrors: true}).wait();
 			this.$androidToolsInfo.validateJavacVersion(this.$sysInfo.getSysInfo(path.join(__dirname, "..", "..", "package.json")).wait().javacVersion, {showWarningsAsErrors: true}).wait();
 		}).future<void>()();
 	}