null/undefined check added

Author: Vladimir Enchev

lib/services/xcproj-service.ts

@@ -39,7 +39,7 @@ class XcprojService implements IXcprojService {
 				let cocoapodVer = this.$sysInfo.getSysInfo(this.$staticConfig.pathToPackageJson).wait().cocoapodVer,
 					xcodeVersion = this.$xcodeSelectService.getXcodeVersion().wait();
 
-				if(!semver.valid(cocoapodVer)) {
+				if(cocoapodVer && !semver.valid(cocoapodVer)) {
 					// Cocoapods betas have names like 1.0.0.beta.8
 					// These 1.0.0 betas are not valid semver versions, but they are working fine with XCode 7.3
 					// So get only the major.minor.patch version and consider them as 1.0.0