Fix:(issue_1197) Set destination field from altsrc for slice flags

altsrc/flag.go

@@ -109,6 +109,9 @@ func (f *StringSliceFlag) ApplyInputSourceValue(cCtx *cli.Context, isc InputSour
 				continue
 			}
 			underlyingFlag.Value = &sliceValue
+			if f.Destination != nil {
+				f.Destination.Set(sliceValue.Serialize())
+			}
 		}
 	}
 	return nil
@@ -137,6 +140,9 @@ func (f *IntSliceFlag) ApplyInputSourceValue(cCtx *cli.Context, isc InputSourceC
 				continue
 			}
 			underlyingFlag.Value = &sliceValue
+			if f.Destination != nil {
+				f.Destination.Set(sliceValue.Serialize())
+			}
 		}
 	}
 	return nil

altsrc/yaml_file_loader.go

@@ -33,11 +33,9 @@ func NewYamlSourceFromFile(file string) (InputSourceContext, error) {
 // NewYamlSourceFromFlagFunc creates a new Yaml InputSourceContext from a provided flag name and source context.
 func NewYamlSourceFromFlagFunc(flagFileName string) func(cCtx *cli.Context) (InputSourceContext, error) {
 	return func(cCtx *cli.Context) (InputSourceContext, error) {
-		if cCtx.IsSet(flagFileName) {
-			filePath := cCtx.String(flagFileName)
+		if filePath := cCtx.String(flagFileName); filePath != "" {
 			return NewYamlSourceFromFile(filePath)
 		}
-
 		return defaultInputSource()
 	}
 }