Fix some issues where nil was passed to a method requiring a non-nil parameter (#1187)

Author: charliewilliams

Parse/Internal/LocalDataStore/OfflineQueryLogic/PFOfflineQueryLogic.m

@@ -145,7 +145,7 @@ - (id)valueForContainer:(id)container
         } else if ([key isEqualToString:@"updatedAt"] || [key isEqualToString:@"_updated_at"]) {
             return object.updatedAt;
         } else {
-            return object[key];
+            return key ? object[key] : nil;
         }
     } else if ([container isKindOfClass:[NSDictionary class]]) {
         return ((NSDictionary *)container)[key];

Parse/Internal/PropertyInfo/PFPropertyInfo.m

@@ -94,7 +94,9 @@ - (instancetype)initWithClass:(Class)kls name:(NSString *)propertyName
         propertySetter = [NSString stringWithFormat:@"set%@:", stringByCapitalizingFirstCharacter(_name)];
     }
 
-    _setterSelector = NSSelectorFromString(propertySetter);
+    if (propertySetter != nil) {
+        _setterSelector = NSSelectorFromString(propertySetter);
+    }
 
     if (_associationType == PFPropertyInfoAssociationTypeDefault) {
         BOOL isCopy = safeStringWithPropertyAttributeValue(objcProperty, "C") != nil;

Parse/PFObject.m

@@ -776,7 +776,9 @@ + (id)_objectFromDictionary:(NSDictionary *)dictionary
                                    defaultClassName:defaultClassName
                                        completeData:(selectedKeys == nil)
                                             decoder:[PFDecoder objectDecoder]];
-    [result->_availableKeys addObjectsFromArray:selectedKeys];
+    if (selectedKeys) {
+        [result->_availableKeys addObjectsFromArray:selectedKeys];
+    }
     return result;
 }
 
@@ -964,7 +966,7 @@ - (void)mergeFromRESTDictionary:(NSDictionary *)object withDecoder:(PFDecoder *)
                 }
 
                 PFOperationSet *localOperationSet = [self unsavedChanges];
-                if (localOperationSet.updatedAt != nil &&
+                if (localOperationSet.updatedAt != nil && remoteOperationSet.updatedAt != nil &&
                     [localOperationSet.updatedAt compare:remoteOperationSet.updatedAt] != NSOrderedAscending) {
                     [localOperationSet mergeOperationSet:remoteOperationSet];
                 } else {
@@ -1304,7 +1306,9 @@ - (void)_mergeFromServerWithResult:(NSDictionary *)result decoder:(PFDecoder *)d
                 state.updatedAt = state.createdAt;
             }
         }];
-        [_availableKeys addObjectsFromArray:result.allKeys];
+        if (result.allKeys) {
+            [_availableKeys addObjectsFromArray:result.allKeys];
+        }
 
         dirty = NO;
     }