feat: Handle weather code as nullable parameter

Sources/Earthquake Network/Libs/Extensions/NSDictionary+EQNExtensions.h

@@ -16,6 +16,10 @@ NS_ASSUME_NONNULL_BEGIN
 /// @param prettyPrint If YES, uses white space and indentation to make the output more readable.
 - (NSString *)eqn_jsonStringWithPrettyPrint:(BOOL)prettyPrint;
 
+/// Returns the value associated with a given key if exists, nil otherwise.
+/// @param aKey The key for which to return the corresponding value
+- (nullable id)eqn_safeObjectForKey:(id)aKey;
+
 @end
 
 NS_ASSUME_NONNULL_END

Sources/Earthquake Network/Libs/Extensions/NSDictionary+EQNExtensions.m

@@ -24,4 +24,13 @@
     return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
 }
 
+- (id)eqn_safeObjectForKey:(id)aKey
+{
+    NSObject *object = [self objectForKey:aKey];
+    if (object == [NSNull null]) {
+        return nil;
+    }
+    return object;
+}
+
 @end

Sources/Earthquake Network/Models/EQNSisma.h

@@ -33,7 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, strong) NSNumber *preliminary;
 @property (nonatomic, strong) NSNumber *smartphoneNumber;
 @property (nonatomic, strong) NSNumber *userNumber;
-@property (nonatomic, strong) NSString *weatherCode;
+@property (nonatomic, strong, nullable) NSString *weatherCode;
 @property (nonatomic, strong) NSString *weatherIcon;
 @property (nonatomic, strong) NSNumber *weatherCloud;
 @property (nonatomic, strong) NSNumber *weatherWindSpeed;

Sources/Earthquake Network/Models/EQNSisma.m

@@ -9,6 +9,7 @@
 #import "EQNSisma.h"
 #import "EQNUser.h"
 #import "EQNUtility.h"
+#import "NSDictionary+EQNExtensions.h"
 
 @implementation EQNSisma
 
@@ -42,7 +43,7 @@
         self.smartphoneNumber = info[@"sm"];
         self.userNumber = info[@"rp"];
         
-        self.weatherCode = info[@"wc"];
+        self.weatherCode = [info eqn_safeObjectForKey:@"wc"];
         self.weatherIcon = info[@"ic"];
         self.weatherCloud = info[@"cl"];
         self.weatherWindSpeed = info[@"ws"];