Fix validation for app service name

Author: Flanker32

PluginsAndFeatures/azure-toolkit-for-intellij/src/main/java/com/microsoft/intellij/util/ValidationUtils.java

@@ -58,8 +58,14 @@ public static void validateAppServiceName(String subscriptionId, String appServi
         if (StringUtils.isEmpty(subscriptionId)) {
             throw new IllegalArgumentException(message("appService.subscription.validate.empty"));
         }
+        if(StringUtils.isEmpty(appServiceName)){
+            throw new IllegalArgumentException(message("appService.name.validate.empty"));
+        }
+        if (appServiceName.length() < 2 || appServiceName.length() > 60) {
+            throw new IllegalArgumentException(message("appService.name.validate.length"));
+        }
         if (!isValidAppServiceName(appServiceName)) {
-            throw new IllegalArgumentException(message("appService.subscription.validate.invalidName"));
+            throw new IllegalArgumentException(message("appService.name.validate.invalidName"));
         }
         final CheckNameAvailabilityResultEntity result = Azure.az(AzureAppService.class).checkNameAvailability(subscriptionId, appServiceName);
         if (!result.isAvailable()) {

PluginsAndFeatures/azure-toolkit-for-intellij/src/main/resources/com/microsoft/intellij/ui/messages/messages.properties

@@ -1367,7 +1367,9 @@ appService.deploy.hint.succeed=Deploy succeed
 appService.deploy.hint.failed=Deploy failed!
 appService.runProcess.hint.processTerminated=The process has been terminated
 appService.subscription.validate.empty=Subscription can not be null
-appService.subscription.validate.invalidName=App service names only allow alphanumeric characters and hyphens, cannot start or end in a hyphen, and must be less than 60 chars.
+appService.name.validate.empty=App service names can not be null
+appService.name.validate.length=App service names be at least 2 characters, and be fewer than 60 characters
+appService.name.validate.invalidName=App service names only allow alphanumeric characters and hyphens, cannot start or end in a hyphen, and must be less than 60 chars.
 appService.logStreaming.hint.connect=Connecting to log stream...
 appService.logStreaming.hint.notStart=Streaming log is not started.
 appService.logStreaming.hint.disconnected=Disconnected from log-streaming service.