Support if statements without a list of statements

lib/modules/coverage/contract_source.js

@@ -162,19 +162,19 @@ class ContractSource {
             line: location.start.line
           };
 
-          children = [node.condition]
-            .concat(node.trueBody.statements);
-
-          if(node.falseBody) children = children.concat(node.falseBody.statements);
-
           markLocations = [declarationLocation];
+          children = [node.condition];
 
-          if(node.trueBody.statements[0]) {
-            node.trueBody.statements[0]._parent = {type: 'b', id: node.id, idx: 0};
+          let trueExpression = (node.trueBody && node.trueBody.statements && node.trueBody.statements[0]) || node.trueBody;
+          if(trueExpression) {
+            children = children.concat([].concat(trueExpression));
+            trueExpression._parent = {type: 'b', id: node.id, idx: 0};
           }
 
-          if(node.falseBody && node.falseBody.statements[0]) {
-            node.falseBody.statements[0]._parent = {type: 'b', id: node.id, idx: 1};
+          let falseExpression = (node.falseBody && node.falseBody.statements && node.falseBody.statements[0]) || node.falseBody;
+          if(falseExpression) {
+            children = children.concat([].concat(falseExpression));
+            falseExpression._parent = {type: 'b', id: node.id, idx: 1};
           }
 
           sourceMapToNodeType[node.src] = [{type: 'b', id: node.id, body: {loc: location}}];

test_apps/coverage_app/contracts/branches.sol

@@ -32,4 +32,9 @@ contract Branches {
   function get() public view returns (uint retVal) {
     return storedData;
   }
+
+  function smallFunctionWithoutStatements() public view returns (uint retVal) {
+    if(false) return storedData * 10;
+    if(true) return storedData * 20;
+  }
 }

test_apps/coverage_app/test/branches_spec.js

@@ -28,4 +28,8 @@ contract("Branches", function() {
   it("should return the smaller number", function(done) {
     Branches.methods.smaller(10).send().then(() => { done(); });
   });
+
+  it("should not crash code coverage on `if` without statements", function(done) {
+    Branches.methods.smallFunctionWithoutStatements().call().then(() => { done(); });
+  });
 });