Add helper categories to NSArray and NSSet

Sources/OpenVPNAdapter/NSArray+Empty.h

@@ -0,0 +1,18 @@
+//
+//  NSArray+Empty.h
+//  OpenVPNAdapter
+//
+//  Created by Sergey Abramchuk on 16/10/2018.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSArray (Empty)
+
+@property (nonatomic, readonly) BOOL isNotEmpty;
+
+@end
+
+NS_ASSUME_NONNULL_END

Sources/OpenVPNAdapter/NSArray+Empty.m

@@ -0,0 +1,16 @@
+//
+//  NSArray+Empty.m
+//  OpenVPNAdapter
+//
+//  Created by Sergey Abramchuk on 16/10/2018.
+//
+
+#import "NSArray+Empty.h"
+
+@implementation NSArray (Empty)
+
+- (BOOL)isNotEmpty {
+    return (self.count > 0) ? YES : NO;
+}
+
+@end

Sources/OpenVPNAdapter/NSSet+Empty.h

@@ -0,0 +1,18 @@
+//
+//  NSSet+Empty.h
+//  OpenVPNAdapter
+//
+//  Created by Sergey Abramchuk on 16/10/2018.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSSet (Empty)
+
+@property (nonatomic, readonly) BOOL isNotEmpty;
+
+@end
+
+NS_ASSUME_NONNULL_END

Sources/OpenVPNAdapter/NSSet+Empty.m

@@ -0,0 +1,16 @@
+//
+//  NSSet+Empty.m
+//  OpenVPNAdapter
+//
+//  Created by Sergey Abramchuk on 16/10/2018.
+//
+
+#import "NSSet+Empty.h"
+
+@implementation NSSet (Empty)
+
+- (BOOL)isNotEmpty {
+    return (self.count > 0) ? YES : NO;
+}
+
+@end