Add dictionary category to remove entries with empty string values

- Part of #87

Author: dempseyatgithub

BuildSettingExtractor/Constants+Categories.h

@@ -37,6 +37,10 @@ extern NSErrorDomain const TPSBuildSettingExtractorErrorDomain;
 // Returns NO if all the values in a dictionary are an empty string
 // Raises an exception if used on a dictionary with any non-NSString value
 - (BOOL)containsBuildSettings;
+
+// Returns a new dictionary containing all entries in the receiver except for
+// entries with an empty string value.
+- (NSDictionary *)tps_dictionaryByRemovingEmptyStringValues;
 @end
 
 #pragma mark -

BuildSettingExtractor/Constants+Categories.m

@@ -71,6 +71,16 @@ - (BOOL)containsBuildSettings {
         return foundNonEmptyString;
     }
 
+- (NSDictionary *)tps_dictionaryByRemovingEmptyStringValues {
+    NSMutableDictionary *temp = [[NSMutableDictionary alloc] init];
+    [self enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull value, BOOL * _Nonnull stop) {
+        if (![value isEqualTo:@""]) {
+            [temp setValue:value forKey:key];
+        }
+    }];
+    return temp;
+}
+
 @end
 
 #pragma mark -