Adding tool default value as string.empty instead of null

Author: DEVAID-MSFT

src/VirtualClient/VirtualClient.Actions/Network/NetworkingWorkload/NetworkingWorkloadToolExecutor.cs

@@ -49,7 +49,7 @@ public string CommandLineLinuxClient
         {
             get
             {
-                return this.Parameters.GetValue<string>(nameof(this.CommandLineLinuxClient));
+                return this.Parameters.GetValue<string>(nameof(this.CommandLineLinuxClient), string.Empty);
             }
 
             set
@@ -65,7 +65,7 @@ public string CommandLineLinuxServer
         {
             get
             {
-                return this.Parameters.GetValue<string>(nameof(this.CommandLineLinuxServer));
+                return this.Parameters.GetValue<string>(nameof(this.CommandLineLinuxServer), string.Empty);
             }
 
             set
@@ -81,7 +81,7 @@ public string CommandLineWindowsClient
         {
             get
             {
-                return this.Parameters.GetValue<string>(nameof(this.CommandLineWindowsClient));
+                return this.Parameters.GetValue<string>(nameof(this.CommandLineWindowsClient), string.Empty);
             }
 
             set
@@ -97,7 +97,7 @@ public string CommandLineWindowsServer
         {
             get
             {
-                return this.Parameters.GetValue<string>(nameof(this.CommandLineWindowsServer));
+                return this.Parameters.GetValue<string>(nameof(this.CommandLineWindowsServer), string.Empty);
             }
 
             set

src/VirtualClient/VirtualClient.Actions/Network/NetworkingWorkload/SockPerf/SockPerfExecutor.cs

@@ -131,15 +131,6 @@ public double ConfidenceLevel
         /// </summary>
         protected IAsyncPolicy ProcessStartRetryPolicy { get; set; }
 
-        /// <summary>
-        /// Produces powershell script parameters using the workload parameters provided.
-        /// </summary>
-        /// <returns>Powershell script parameters as a string.</returns>
-        protected override string GetCommandLineArguments()
-        {
-            return string.Empty;
-        }
-
         /// <summary>
         /// Initializes the environment and dependencies for running the tool.
         /// </summary>