Fixed Ignore Blank Fields On Create

Removed erroneous IsPrimaryKey check which caused fields that were not part of the Primary Key but were Blank to be inserted.

(Particularly a problem because DeletedAt would be set to the zero value.)

callback_create.go

@@ -63,7 +63,7 @@ func createCallback(scope *Scope) {
 					if field.IsBlank && field.HasDefaultValue {
 						blankColumnsWithDefaultValue = append(blankColumnsWithDefaultValue, scope.Quote(field.DBName))
 						scope.InstanceSet("gorm:blank_columns_with_default_value", blankColumnsWithDefaultValue)
-					} else if !field.IsPrimaryKey || !field.IsBlank {
+					} else if !field.IsBlank {
 						columns = append(columns, scope.Quote(field.DBName))
 						placeholders = append(placeholders, scope.AddToVars(field.Field.Interface()))
 					}