Fix bug preprocessing unbracketed if else statements

lib/preprocessor.js

@@ -57,7 +57,8 @@ module.exports.run = function r(contract) {
         if (node.trueBody.type !== 'Block') {
           insertions.push({type: OPEN, pos: node.trueBody.range[0]});
           insertions.push({type: CLOSE, pos: node.trueBody.range[1] + 1});
-        } else if ( node.falseBody && node.falseBody.type !== 'Block' ) {
+        }
+        if ( node.falseBody && node.falseBody.type !== 'Block' ) {
           insertions.push({type: OPEN, pos: node.falseBody.range[0]});
           insertions.push({type: CLOSE, pos: node.falseBody.range[1] + 1});
         }

test/if.js

@@ -19,6 +19,14 @@ describe('if, else, and else if statements', () => {
     util.report(output.errors);
   });
 
+  it('should compile after instrumenting unbracketed if-elses', () => {
+    const contract = util.getCode('if/if-else-no-brackets.sol');
+    const info = getInstrumentedVersion(contract, filePath);
+    const output = JSON.parse(solc.compile(util.codeToCompilerInput(info.contract)));
+    util.report(output.errors);
+  });
+
+
   it('should cover an if statement with a bracketed consequent', done => {
     const contract = util.getCode('if/if-with-brackets.sol');
     const info = getInstrumentedVersion(contract, filePath);

test/sources/if/if-else-no-brackets.sol

@@ -0,0 +1,10 @@
+pragma solidity ^0.5.0;
+
+contract Test {
+  function a(uint x,uint y, uint z) public {
+    if (x==y)
+      x = 5;
+    else
+      x = 7;
+  }
+}