[AndroidSdkWindows] Guard against exception checking registry (#79)

Fixes: https://developercommunity.visualstudio.com/content/problem/883179/ilegal-characters-in-path-after-fresh-install.html
Somehow, a registry key contains invalid path characters.
This causes an `ArgumentException` from
`AndroidSdkWindows.CheckRegistryKeyForExecutable()`:
System.ArgumentException: Illegal characters in path.
at System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional)
at System.IO.Path.Combine(String path1, String path2)
at Xamarin.Android.Tools.AndroidSdkWindows.CheckRegistryKeyForExecutable(UIntPtr key, String subkey, String valueName, Wow64 wow64, String subdir, String exe)
at Xamarin.Android.Tools.AndroidSdkWindows.<GetAllAvailableAndroidSdks>d__37.MoveNext()
at System.Linq.Enumerable.<DistinctIterator>d__64`1.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at Xamarin.Android.Tools.AndroidSdkBase.get_AllAndroidSdks()
at Xamarin.Android.Tools.AndroidSdkBase.Initialize(String androidSdkPath, String androidNdkPath, String javaSdkPath)
at Xamarin.Android.Tools.AndroidSdkWindows.Initialize(String androidSdkPath, String androidNdkPath, String javaSdkPath)
at Xamarin.Android.Tools.AndroidSdkInfo..ctor(Action`2 logger, String androidSdkPath, String androidNdkPath, String javaSdkPath)
Handle the `ArgumentException` by wrapping the body of
`CheckRegistryKeyForExecutable()` within a `try/catch` block and
catch all exceptions. If an exception is thrown, there is no
executable of interest.

Author: jpobst

src/Xamarin.Android.Tools.AndroidSdk/Sdks/AndroidSdkWindows.cs

@@ -303,19 +303,23 @@ public override void SetPreferredAndroidNdkPath (string path)
  #region Helper Methods
 privatestaticboolCheckRegistryKeyForExecutable(UIntPtrkey,stringsubkey,stringvalueName,RegistryEx.Wow64wow64,stringsubdir,stringexe)
 {
-stringkey_name=string.Format(@"{0}\{1}\{2}",key==RegistryEx.CurrentUser?"HKCU":"HKLM",subkey,valueName);
+try{
+stringkey_name=string.Format(@"{0}\{1}\{2}",key==RegistryEx.CurrentUser?"HKCU":"HKLM",subkey,valueName);
 
-varpath=NullIfEmpty(RegistryEx.GetValueString(key,subkey,valueName,wow64));
+varpath=NullIfEmpty(RegistryEx.GetValueString(key,subkey,valueName,wow64));
 
-if(path==null){
-returnfalse;
-}
+if(path==null){
+returnfalse;
+}
 
-if(!ProcessUtils.FindExecutablesInDirectory(Path.Combine(path,subdir),exe).Any()){
+if(!ProcessUtils.FindExecutablesInDirectory(Path.Combine(path,subdir),exe).Any()){
+returnfalse;
+}
+
+returntrue;
+}catch(Exception){
 returnfalse;
 }
-
-returntrue;
 }
  #endregion