Fix analyze issue introduced in Xcode 12.5

Author: paulb777

.swiftpm/xcode/xcshareddata/xcschemes/ABTestingUnit.xcscheme

@@ -5,6 +5,22 @@
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "NO"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "ABTestingUnit"
+               BuildableName = "ABTestingUnit"
+               BlueprintName = "ABTestingUnit"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
    </BuildAction>
    <TestAction
       buildConfiguration = "Debug"

FirebaseABTesting/CHANGELOG.md

@@ -1,3 +1,6 @@
+# v8.2.0
+- [fixed] Fixed analyze issue introduced in Xcode 12.5. (#8209)
+
 # v7.7.0
 - [added] Added community support for watchOS. ABTesting can now build on watchOS, but some functions might not work yet. (#7481)
 

FirebaseABTesting/Sources/ABTExperimentPayload.m

@@ -60,7 +60,7 @@ + (NSDateFormatter *)experimentStartTimeFormatter {
   return dateFormatter;
 }
 
-+ (instancetype)parseFromData:(NSData *)data {
++ (nullable instancetype)parseFromData:(NSData *)data {
   NSError *error;
   NSDictionary *experimentDictionary =
       [NSJSONSerialization JSONObjectWithData:data

FirebaseABTesting/Sources/Private/ABTExperimentPayload.h

@@ -77,7 +77,7 @@ typedef NS_ENUM(int32_t, ABTExperimentPayloadExperimentOverflowPolicy) {
 
 /// Parses an ABTExperimentPayload directly from JSON data.
 /// @param data  JSON object as NSData. Must be reconstructible as an NSDictionary<NSString* , id>.
-+ (instancetype)parseFromData:(NSData *)data;
++ (nullable instancetype)parseFromData:(NSData *)data;
 
 /// Initializes an ABTExperimentPayload from a dictionary with experiment metadata.
 - (instancetype)initWithDictionary:(NSDictionary<NSString *, id> *)dictionary