[Issue #86] Defaulting client secret to empty string

Author: mattt

AFOAuth2Manager/AFOAuth2Manager.h

@@ -62,7 +62,7 @@
  Creates and initializes an `AFOAuth2Manager` object with the specified base URL, client identifier, and secret.
 
  @param url The base URL for the HTTP client. This argument must not be `nil`.
- @param clientID The client identifier issued by the authorization server, uniquely representing the registration information provided by the client.
+ @param clientID The client identifier issued by the authorization server, uniquely representing the registration information provided by the client. This argument must not be `nil`.
  @param secret The client secret.
 
  @return The newly-initialized OAuth 2 client
@@ -75,7 +75,7 @@
  Initializes an `AFOAuth2Manager` object with the specified base URL, client identifier, and secret. The communication to to the server will use HTTP basic auth by default (use `-(id)initWithBaseURL:clientID:secret:withBasicAuth:` to change this).
 
  @param url The base URL for the HTTP client. This argument must not be `nil`.
- @param clientID The client identifier issued by the authorization server, uniquely representing the registration information provided by the client.
+ @param clientID The client identifier issued by the authorization server, uniquely representing the registration information provided by the client. This argument must not be `nil`.
  @param secret The client secret.
 
  @return The newly-initialized OAuth 2 client

AFOAuth2Manager/AFOAuth2Manager.m

@@ -102,7 +102,7 @@ - (id)initWithBaseURL:(NSURL *)url
                secret:(NSString *)secret
 {
     NSParameterAssert(clientID);
-    
+
     self = [super initWithBaseURL:url];
     if (!self) {
         return nil;
@@ -131,6 +131,14 @@ - (void)setUseHTTPBasicAuthentication:(BOOL)useHTTPBasicAuthentication {
     }
 }
 
+- (void)setSecret:(NSString *)secret {
+    if (!secret) {
+        secret = @"";
+    }
+
+    _secret = secret;
+}
+
 #pragma mark -
 
 - (AFHTTPRequestOperation *)authenticateUsingOAuthWithURLString:(NSString *)URLString