Fix issue when no having Python app already installed

Author: MattEqualsCoder

MSUScripter/MSUScripter.csproj

@@ -8,7 +8,7 @@
     <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     <ApplicationIcon>MSUScripterIcon.ico</ApplicationIcon>
     <PackageIcon>MSUScripterIcon.ico</PackageIcon>
-    <Version>5.0.2</Version>
+    <Version>5.0.3</Version>
     <RuntimeFrameworkVersion>9.0.0</RuntimeFrameworkVersion>
     <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
     <LangVersion>12</LangVersion>

MSUScripter/Services/PythonCompanionService.cs

@@ -36,7 +36,7 @@ public async Task<bool> VerifyInstalledAsync()
         var response = await RunCommandAsync("--version");
 
         IsValid = response.Success && VerifyVersionNumber(response.Result) &&
-                  !response.Error.Contains("Couldn't find ffmpeg");
+                  !response.Error.Contains("ffmpeg");
 
         if (IsValid)
         {
@@ -52,8 +52,12 @@ public async Task<bool> VerifyInstalledAsync()
 
     private bool VerifyVersionNumber(string versionString)
     {
+        if (versionString.IndexOf('v') <= 0)
+        {
+            return false;
+        }
         var minVersion = MinVersion.VersionStringToDecimal();
-        var currentVersion = versionString.Substring(versionString.IndexOf('v')).VersionStringToDecimal();
+        var currentVersion = versionString[versionString.IndexOf('v')..].VersionStringToDecimal();
         return currentVersion >= minVersion;
     }