Fix detection of Abi version in contract with only constructor

__mocks__/cairo/onlyConstructor/onlyConstructor.cairo

@@ -0,0 +1,15 @@
+#[starknet::contract]
+pub mod OnlyConstructor {
+    use starknet::ContractAddress;
+    use starknet::storage::Map;
+
+    #[storage]
+    struct Storage {
+        names: Map::<ContractAddress, felt252>,
+    }
+
+    #[constructor]
+    fn constructor(ref self: ContractState, name: felt252, address: ContractAddress) {
+        self.names.write(address, name);
+    }
+}

__mocks__/cairo/onlyConstructor/onlyConstructor.casm

@@ -0,0 +1 @@
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