Don't allow undefined process.argv[1] in parser

argParse breaks if process.argv[1], which is a problem if Appium is being run as a binary. Added check so that if process.argv[1] is undefined, set the prog name to 'Appium'

lib/parser.js

@@ -782,7 +782,8 @@ function getParser () {
   let parser = new ArgumentParser({
     version: pkgObj.version,
     addHelp: true,
-    description: 'A webdriver-compatible server for use with native and hybrid iOS and Android applications.'
+    description: 'A webdriver-compatible server for use with native and hybrid iOS and Android applications.',
+    prog: process.argv[1] || 'Appium'
   });
   let allArgs = _.union(args, deprecatedArgs);
   parser.rawArgs = allArgs;

test/config-specs.js

@@ -194,6 +194,30 @@ describe('Config', () => {
     });
   });
 
+  describe('parsing args with empty argv[1]', () => {
+    let argv1;
+
+    before(() => {
+      argv1 = process.argv[1];
+    });
+
+    after(() => {
+      process.argv[1] = argv1;
+    });
+
+    it('should not fail if process.argv[1] is undefined', () => {
+      process.argv[1] = undefined;
+      let args = getParser();
+      args.prog.should.be.equal('Appium');
+    });
+
+    it('should set "prog" to process.argv[1]', () => {
+      process.argv[1] = 'Hello World';
+      let args = getParser();
+      args.prog.should.be.equal('Hello World');
+    });
+  });
+
   describe('validateServerArgs', () => {
     let parser = getParser();
     parser.debug = true; // throw instead of exit on error; pass as option instead?