Fix iOS7 constraint warnings

Author: sunnyxx

Demo/Demo.xcodeproj/project.pbxproj

@@ -301,7 +301,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = Demo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
@@ -312,7 +312,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = Demo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};

Demo/Demo/FDFeedCell.m

@@ -20,13 +20,21 @@ @interface FDFeedCell ()
 
 @implementation FDFeedCell
 
+- (void)awakeFromNib
+{
+    [super awakeFromNib];
+    
+    // Fix the bug in iOS7 - initial constraints warning
+    self.contentView.bounds = [UIScreen mainScreen].bounds;
+}
+
 - (void)setEntity:(FDFeedEntity *)entity
 {
     _entity = entity;
 
     self.titleLabel.text = entity.title;
     self.contentLabel.text = entity.content;
-    self.contentImageView.image = [UIImage imageNamed:entity.imageName];
+    self.contentImageView.image = entity.imageName.length > 0 ? [UIImage imageNamed:entity.imageName] : nil;
     self.usernameLabel.text = entity.username;
     self.timeLabel.text = entity.time;
 }