Fix crash in RCTJSStackFrame::stackFrameWithDictionary:

Summary:
Motivation: When logging to RCTRedBox, if any of the stack frames lacks a line number or a column, the application will crash with `[NSNull integerValue]: unrecognized selector sent to instance`.
Closes #13242

Differential Revision: D4812185

Pulled By: hramos

fbshipit-source-id: 4b1c3c38f67cf59034a383c95d4280d1b6380300

React/Base/RCTJSStackFrame.m

@@ -70,8 +70,8 @@ + (instancetype)stackFrameWithDictionary:(NSDictionary *)dict
 {
   return [[self alloc] initWithMethodName:dict[@"methodName"]
                                      file:dict[@"file"]
-                               lineNumber:[dict[@"lineNumber"] integerValue]
-                                   column:[dict[@"column"] integerValue]];
+                               lineNumber:[RCTNilIfNull(dict[@"lineNumber"]) integerValue]
+                                   column:[RCTNilIfNull(dict[@"column"]) integerValue]];
 }
 
 + (NSArray<RCTJSStackFrame *> *)stackFramesWithLines:(NSString *)lines